Electrical Products Manufacturing Company, 69 Sprague St, Providence, RI was established in 1919 14 . President was Frank E Dyson, Vice President was Thomas P Giblin, Secretary and general manager was H A McAvoy and Treasurer was Charles Eddy. 1 Frank E Dyson was also formed the Commercial Radio Company of America with Thomas P Giblin, and Ratcliffe G E Hicks 5.
In 1920 Electrical Products Manufacturing Company had radio station 1XF transmitting at both 300 and 600 wavelength. 3
In 1922, Dymac leased large floor space at 24 Fountain St, in Providence in addition to their regular plant. 2
Frank E Dyson left Universal Winding in 1922 to devote his entire time to Electical Products Manufacturing Company.
The 1923 Journal of the A.I.E.E. (American Institute of Electrical Engineers) lists Mr Omar E Cote as the Chief Engineer. 4 and their address as 69 Sprague Street 10.
In 1924 Electrical Products Manufacturing Company hired the Lachar-Horton Company to direct advertising for the firm. 11
In 1925 Electrical Products Manufacturing Company brings Charles V Logwood on as their chief engineer. Mr Logwood was the co-inventor ,with Dr Lee Deforest, of the audion tube, which made broadcasting possible. He alone discoverd the Audion amplifier which came into use in 1912. He also directed the installation of the first three broadcast stations in the United States. 15
In 1925 Electrical Products came out with a new catalog describing their new product line and factory 16
Dymac Selecto Five radio receiver
Dymac loud speaker
Dymac head sets types "F", "G" and "E"
Dymac vernier dials
Dymac sub-panel sockets
Dymac standard rheostats
Dymac variable condensers
Dymac audio-frequency transformers types "G", "H" and "E"
Dymac audio amplifying transformers type A-1
Dymac standard jacks
Dymac duo lateral coils
Dymac crystal set outfit
Dymac standard electrical soldering iron kit
The 1926 Providence Directory still lists Frank E Dyson president but now H A McAvoy in the treasurer and Ratcliffe G E Hicks, Secratary. The company is still at 69 Sprague Street with 150 employees. 6
I know from their ads they made headphones, speakers and a 5 tube set called the selecto-five 12. There is also an ad for a six-tube receiver kit.
In the 1927 Providence Directory there is a listing for George W Hamilton as tresurer 7.
In 1928 the factory was turning out 116 coil types for the Signal Engineering Corporation of the U S Government. The factory did all the work for the radio department of the United States 13.
We find Electical Products Manufacutring Company still listed at 69 Sprague Street in 1929 8, and 1932 9 and then again in 1932 with the addition of George W Hamilton as the receiver 9.
On January 4th 1930, there was a fire and Electical Products Manufacutring Company 1t 69 Sprague St in Providence. Fortunatly damage was slight.
February 5, 1930
It seems that after a court case with ACME Wire Company Electical Products Manufacturing Company went into receivership and the entire business was auctioned off on April 14th, 1930. 17
April 15, 1930
February 5, 1930
June 4, 1930
June 15, 1930
October 14, 1930
In 1938 we see one last mention of the company when the state posts that they have lost their Charter.
Click to enlarge
Providence Journal November 30, 1938
Duo-Lateral Type Inductances
1 EMF Electrical Year Book, Volume 1, 1921
2 Electrical World, Volume 79, 1922
3 Commercial and Government Radio Stations of the U.S., 1920
4 1923 A.I.E.E. Journal
5 Acts And Resolves Passed By The General Assembly Of The State Of Rhode Island And Providence Plantations, 1920
6 Providence Directory, 1926
7 Providence Directory, 1927
8 Providence Directory, 1929
9 Providence Directory, 1932
10 Providence Directory, 1923
11 Advertising and Selling Fortnightly, November 1924
12 Radio Call Book, Fall, 1923
13 Asbury Park Press September 28, 1925
14 Electical Review Vol75 July 4-29, 1919
15 Talking Machine September 1925
16 Talking Machine September 1925
17 Providence Journal April 19, 1930