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Coto-Coil Company is still in business today. Origionally started by Universal Winding Co. of Providence, RI, who made the machines that were used in the textile industry 2.


Universal Winding Company



Universal Winding Company Plant in Auburn, RI




Complete automatic coil winding machines. Left, machine for winding wire in layers, each as an angle to the axis of the coil, and to the preceding layer: makes a self-supporting coil requiring no binding nor flanges, narrow coils of large diameter are made on this machine. Right, machine for making Universal interweave or cross-wound coils, in which a cotton binding is interwoven with the parallel layers of wire. Both machines have automatic brakes for stopping machine in case of wire breaking, and counters to stop machine when required number of turns are completed. Made by Universal Winding Co., Providence. R. I. 1919 7


With $100,000 in capital stock Coto-Coil was founded in 1917 by Rob A Leeson 1, one of its principle leaders was Thomas P Giblin.

In 1921 John S Elliot is the manager at 87 Willard Street, the office and main factory and there is a branch office at 95 South Street in Boston. 9

Other engineers 4 working for Coto-Coil were Granville P Lindley b1891 (Lead Engineer of the Byrd Expedition II) 3 and Lewis Bellem (1BES). Lindley and Bellam were also responsible for bringing Radio Equipment to Pitcairn Island in the South Pacific made famous by the landing place of the mutineers from the HMS Bounty. The island, cut off from the rest of the world since 1790, received a modern short-wave receiver and a 60-watt transmitter in 1938. The equipment was made possible by the generous donation of material and labor of many amateurs and manufacturers under the instigation of the Coto-Coil Company. The companies involved were Aerovox Corporation, American Lava Corp, Amperex Electronic, Bassett Research, Biley Electric Company, Cardwell Manufacturing Company, Coto-Coil Company, Kanyon Transformer Company, Ohmite Manufacutring Company, Par-Metal Products, Parris-Dunn Corporation, Pioneer Genemotor Corporation, RCA Radiotron, E M Sargent Company, Shure Brothers, Triplett, Willard Storage Battery Company (Providence). 5

In 1938, President of Coto-Coil was F C Hendrickson 6

Coto Technology is still in business today. Their tag line now is "The World Leader in Small Signal Switching Solutions", and their products today include, Reed relays and Switches, Mosfet relays, and the world's smallest reed sensor. In the late teens and twenties they were the leader in Radio related coils. They also made at least one radio receiver as shown in the ad below.

Universal Windong eventually became the Leesona Corp which is still in business today.




Products


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Type 4500 "SPECIAL" Audio Frequency Transformer.

Radio News
January 1921

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Inductance Coil, "Duo-Lateral" Type 75.

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Inductance Coil, "Duo-Lateral" Box.

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Type 5000 Audio Frequency Amplifying Coil and box
Single and two ganged together.

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Type 1250 "Duo-Lateral coil".

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Type 250 Inductance COil
Patented April 8, 1924
For Experimental and Amateur Use Only

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Type 7000 Tube Socket.

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Type 8000 Compact Bakelite Variometer.

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Type 9000 Compact Variocoupler.

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Set of "Duo-Lateral" coils very much like Coto-Coil.

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Coto Coil Company
Symphonic
Photo Courtesy of Dick Parks




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Coto Coil Company
Symphonic
Photo Courtesy of Dick Parks



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Coto Coil Company
Symphonic
Photo Courtesy of Dick Parks



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Coto Coil Company
Symphonic
Photo Courtesy of Dick Parks



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antiqueradios.com
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Coto 25 ohm inductance coil with box
Photo Courtesy of "wazz"



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CI-45 Control Wheel



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Transmitting Inductance
CS-610-E



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Transmitting Inductance
CI-160A



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Transmitting Inductance
CI-160TVL



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Transmitting Inductance
CI-40A



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Transmitting Inductance
CI-60TVL



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Transmitting Inductanceg
CI-80A



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Transmitting Inductanceg
CI-X



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Transmitting Inductance
CI-10TVL



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Transmitting Inductance
CI-20BY



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Transmitting Inductance
CI-60BT



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Transmitting Inductance
CI-20BT



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Transmitting Inductance
680E



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"PEE-WEE" Inductance
Tube Socket Mounting
CS-610-C




600 Meter
Transitting Inductance Coil



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QSL Card with radio discription that
includes COTO-COIL RF stage
Lewis S Bellem, 90 Stanwood St, Providence, RI
Lewis S Bellem was an Engineer at COTO-COIL



Click to enlarge
Click to enlarge
QSL Card with radio discription that
includes COTO-COIL RF stage
Lewis S Bellem, 90 Stanwood St, Providence, RI
Lewis S Bellem was an Engineer at COTO-COIL



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QSL Card
Lewis S Bellem, 90 Stanwood St, Providence, RI
Lewis S Bellem was an Engineer at COTO-COIL

New England Wireless and Steam Museum

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antiqueradios.com
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Coto molded dial
Photo Courtesy of "grid-leak"



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antiqueradios.com
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Coto tuning cap
Photo Courtesy of "grid-leak"




Variable Air Condenser
Model 3010, .001MF




Variable Air Condenser
Model 3010, .001MF




CI-45 Control Wheel




CI-45 Control Wheel




CI-45 Control Wheel




CI-45 Control Wheel




CI-45 Control Wheel




CI-40 Control Wheel




Yale Peabody Museum of Natural History

Coto-Coil Vario-Coupler, 1920's


Giblin was visited in January, 1919 by Robert F. Gowen an engineer who worked for Lee DeForest. Ever since the cancelation of government contacts, Deforest became interested in the amateur market and he sent Gowen to meet with Giblin to work out the manufacutring of Honeycomb coils to be used in Gowens newly conceived "unit" sets with plug in coils.9

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DeForest Coils
Wound by Coto-Coil


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DeForest Coils
Wound by Coto-COil


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DeForest Coils
Wound by Coto-Coil


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DeForest Coils
Wound by Coto-Coil


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DeForest Coils
Wound by Coto-Coil


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DeForest Coils
Wound by Coto-Coil


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DeForest Coils
Wound by Coto-Coil



Ads

antiqueradios.com
Click to enlarge
Coto Coil Company
Symphonic
Photo Courtesy of Alan Douglas





Radio Broadcast January, 1927





Solenoid Coil and Field Coil 1919 7





Square Cross-Wound COil 1919 7



antiqueradios.com
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St Louis Post-Dispatch
December 27 1924



antiqueradios.com
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Coto Coil Company
Symphonic
Photo Courtesy of Alan Douglas


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Radio Progress, April 15th, 1924.
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Radio Progress, May 15th, 1924.
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Radio Progress, April 1st, 1924.
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Radio Progress, May 1st, 1924.
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Radio Progress, July 1st, 1924.
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Citizens Radio Call Book, May, 1923.
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Citizens Radio Call Book, Fall, 1924.

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Everyday Engineering, June 1920.

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The Radio Trade Directory, 1924.

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Popular Radio, December, 1923.

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Digest, March, 1923.

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Popular Radio, December, 1923.

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Electrical Record, December, 1922.

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Electrical Record, December, 1922.

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Radio News, November, 1920.

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Radio News, May, 1921.

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Radio News, March, 1921.

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Radio, June, 1922.

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Radio News November, 1922.

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QST February, 1922

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Popular Science, March, 1924.

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Providence Journal September 1922.

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Radio News, December, 1920.


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Radio March, 1923.

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Radio News, August, 1921.

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Radio News, February, 1922.

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Radio Digest, December, 1923.

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Communication and Broadcast
Engineering, April 1936.


Communication and Broadcast
Engineering, April 1936.


Radio News, July 1940.

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The Bridgeport Telegram
September 22, 1923.

Radio Industry September, 1925.
5

Pitcairn Now in 'Radio Circle'


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First Day Cover, Pitcairn Island, March 18, 1938


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First Day Cover, Pitcairn Island, March 18, 1938


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First Day Cover, Pitcairn Island
L S Bellem Jr
Director of Engineering
March 18, 1938


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First Day Cover, Pitcairn Island
Granville P Lindley
Radio Engineer
March 18, 1938


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First Day Cover, Pitcairn Island
L S Bellem Jr
Director of Engineering
March 18, 1938


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First Day Cover, Pitcairn Island
Granville P Lindley
Radio Engineer
March 18, 1938


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Letter to Granville P Lindley, November 17, 1939




Marconi Stamp with Pitcairn Island Station

Pitcairn Island Exbidition Recording


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The Evening News (Harrisburg, Pennsylvania)
24 Feb 1938, Thu Page 20


A NEW VOICE FOR "PITC"
-PITCAIRN ISLAND
By LEW BELLEM W1BES Chief Engineer,
Coto-Coil Co., Inc.


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Press Photo (Front)
Back from Pitcairn Island
May 23rd, 1938


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Press Photo (Back)
Back from Pitcairn Island
May 23rd, 1938



Radio News, January 1921.

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Popular Radio, May, 1923.

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Radio, June, 1922.

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Electrical world, 1922.

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The Edison Monthly VOL10 1917.

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Radio Engineering, June 1931.



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Radio Today
April 1939



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Radio News, Aptil 1923

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Wireless Age, July 1924.


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Radio News, April 1923.


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Electrical Merchandising, May 1922.



Mid 1940's Ads

I included this series of mid 1940's ads because
they look like older photos of the Coto-Coil factory


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Coto Close-Ups

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Modern Coil Windings
On Bobbins

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Modern Coil Windings
With Yarn

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Modern Coil Windings

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Modern Coil Windings
Partial View of Assembly Department

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Modern Coil Windings
Partial View of
Automatic Coil Winding Department


PATENTS


US1577749
Coil Mounting

US1490040
Electrical Coil

US1490041
Electrical Coil

US1478342
Electrical Air Condenser

US1576638
Electrical Socket

US110995
Hand COntrol For Radio
And Like Aparatus

Click to enlarge
Wireless Age, July, 1924.



1 Electrical Railway Journal, May 26th, 1917

2 Universal Winding Co.

3 1910 US Census.

4 The Early Shortwave Stations: A Broadcasting History Through 1945 By Jerome S. Berg.

6 The Evening News (Harrisburg, Pennsylvania) 24 Feb 1938, Thu Page 20

7 Special Devices for Electrical Uses, 1919

8 Special Devices for Electrical Uses, 1919

9 EMF Electrical Year Book, 1921

10 De Forest company engineer travels to Providence to work out manufacturing of Honycomb coils with Thomas P Giblin