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History of the manufacturer  

Holtzer-Cabot Electric Co., (The); Boston, Massachusetts

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Name: Holtzer-Cabot Electric Co., (The); Boston, Massachusetts    (USA)  
Abbreviation: holtzer
Products: Model types

HOLTZER-CABOT; The Holtzer-Cabot Electric Co.; 125 Amory Street, Boston, Massachusetts; founded 1875.
In a 1909 Popular Electricity advertisement the company had a Western Sales Office at 395 Dearborn Street in Chicago, Illinois.
The company made headsets from at least 1909. In the 1920's the company also manufactured Loudspeakers and was still listed in the August 1926 McGraw-Hill Radio Trade Directory as a manufacturer of speakers.

Founded: 1875

Some models:
Country Year Name 1st Tube Notes
USA  23 National Horn Speaker   Adjustable Control. Price later reduced to $12.00 
USA  40 Receiver R-14 U.S. Army Headphones   Double headphones: "Receiver R-14 made by Holtzer Cabot for the Signal Corps of the U.S.Ar... 
USA  13 Double Headset   Headset 2200 ohms. Aluminium shells, rubber-covered bands, weight 10,5 ozs.  
USA  23 No.4 National Headphones    
USA  23 No.2 Universal Headphones    
USA  23 Loudspeaker Phonograph Attachment   Horn speaker driver for application to a Grammophone, using its horn. 
USA  26 Reproducing Unit (Horn Driver)   Reproducing Unit for horn speakers. 


Further details for this manufacturer by the members (rmfiorg):

Ad in Radio News, March 1924tbn_radionews_mr.1924s.1278.gif
Radio Broadcast, Nov. 1925, p. 102tbn_usa_holtzer_cabot.jpg
Radio Broadcast, Dec. 1923, p. 177tbn_usa_holtzer_cabot~~1.jpg
Radio Broadcast, Apr. 1924, p. 537tbn_usa_holtzer_cabot_3.jpg
June 1909 Popular Electricity magazine advertisement (advertising pages not numbered)tbn_usa_holtzercabot_ad_june1909_popular_electricity.jpg