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Electrical Products Manufacturing Company, 69 Sprague St, Providence, RI was established in 1919. 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

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

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 The chief engineer for the Electrical Products Manufacturing Company (Dymac) in 1926 was Charles V Logwood. 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.

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.


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Radio Call Book, Fall, 1923


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Dymac Type-E Headphones, 1923

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Dymac Type-E Headphones, 1923

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Electrical Products Manufacturing Headphones

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Electrical Products Manufacturing Headphones

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DYMAC TYPE-C LOUD SPEAKER
Phonograph Attachment

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DYMAC TYPE-C LOUD SPEAKER
Phonograph Attachment

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DYMAC TYPE-C LOUD SPEAKER
Phonograph Attachment


DYMAC TYPE-F Headphone

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DYMAC TYPE-G Headphone
In origional box.

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"Dymac Somerlog" Receiver
Popular Radio, November 1926

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Radio Call Book, Fall, 1923

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Radio Industry September, 1925

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Citizens Radio Call Book, Fall, 1924

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Citizens Radio Call Book, Fall, 1924

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Dymac Selecto Five
Radio News, December, 1925
Providence, RI

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Dymac Selecto Five
Radio News, May, 1923
Providence, RI

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The Brooklyn Eagle
November 2, 1925

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The Brooklyn Eagle
October 26, 1925

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Altoona Tribune
March 22, 1924

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The Brooklyn Eagle
April 29, 1925

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The Brooklyn Eagle
April 1, 1925

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The Bee April 24, 1924

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The Daily Courier
January 15, 1926

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The Davenport Democrat and Leader
December 12, 1924

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Suburbanite Economist
March 11, 1925

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Altoona Tribune
March 22, 1924

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The Morning Herald
February 12th 1926

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The Daily Courier
January 15th 1926

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The Brooklyn Daily Eagle
Thursday March 4th 1926

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The Morning Herald
January 8th, 1926

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The Cincinnati Enquirer
March 23 1924

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News-Journal
September 23 1925

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Altoona Tribune
March 27, 1924

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The Daily Courier
February 11, 1927

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The Morning Herald
March 13, 1926

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The Brooklyn Eagle
March 22, 1925

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Electrical News
Toronto
February 1 1922

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The Brooklyn Eagle
February 1, 1925

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The Davenport Democrat and Leader
October 18, 1925
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Dymac Six-Tube Receiving Kit
Radio News, December, 1926
Providence, RI
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Radio Industry September 1925

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Dymac Selecto Five
Providence, RI


Altoona Tribune
March 27th 1924

The Electrical Record, Vol XXXI,
January ,1922

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Popular Radio, April 1925

Brooklyn Daily Eagle
June 2nd, 1925

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The Brooklyn Daily Eagle
May 21, 1925

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News-Journal
March 6 1927

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Asbury Park Press
October 10 1925




PATENTS


US1520466
TELEPHONE HEADSET

US1540514
COIL MOUNTING

US1520466
TELEPHONE HEADSET



ARTICALS




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