Supertone Radio Company was in Bristol, RI. Very nicely made set and the only example I have ever seen. It has one Thorandson audio transformer and one unknown stage. Spring mounted sockets. Very high quality all around.
Finally some more information on this one and it was right under my nose!
I believe that the G. P. L are the initials of Granville P Lindley. The connection was discovered in this bankruptcy announcment for a Bristol Rhode Island radio dealer.
By right under my nose I mean Granville P Lindley was an engineer at Coto-Coil and the (Lead Engineer of the Byrd Expedition II) 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.
Lindley was born In 18911 in Connecticut. In 1915 he took the Minnie V Pope2 for a test run, of which he was part owner.
In 1933 Lineley leaves Boston Harbor on board the Ruppert as part of the Byrd Expedition II to the Antarctic. One of 3 Rhode Islanders on the expedition
Lindley arrived back in New York on April 9th, 1934
In December, 1935 Admiral Byrd is in Providence and lectures on his Expedition II to the Antarctic and praised the three Rhode Islanders onboard, Granville P Lindley, Chief Electrican, Antone Carbone, the expedition cook and Lawrence Kennedy, respondoble for tents and weather proofing clothing.
Granville P Lindley himself then lectures many time throughout the state on his involvment in the expedition
In 1956, Lindley, hospitalized for complications from Asthma, receives a radiogram from Admiral Byrd wishing him a speedy recovery.
Lindley died December 18, 1956.
1 1940 Census
2 Warren Times-Gazette, August 5, 2015