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History of the manufacturer  

Coto Coil Manufacturing, Providence , RI

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Name: Coto Coil Manufacturing, Providence , RI    (USA)  
Abbreviation: coto
Products: Model types Others Tube manufacturer
Summary:

Coto Corporation, dba Coto Technology, originated in Providence, Rhode Island, USA in 1917 as Coto Coil Incorporated - a company specializing in the design and manufacture of coil windings.

In the November 1924 The Radio Trade Directory under the heading manufacturers of Vacuum Tube Sets on page 80, the Coto-Coil Company was located in Providence, Rhode Island.
Trade Name: "Symphonic"

Founded: 1917
History:
During the mid-1960's, Coto expanded its product line by introducing the reed relay - the result of integrating reed switches into coil windings. By 1970, Coto emerged as a leading manufacturer of reed relays with the development of the first patented Low-Thermal EMF reed relay.

This manufacturer was suggested by Joseph Woychowski.


Some models:
Country Year Name 1st Tube Notes
USA  23 7000 tube socket    
USA  24 Coto Symphonic   Three variocoupler design. 
USA  22 Coto Variable Air Condenser   Coto-Coil Company Variable Air Condenser. 

[rmxhdet-en]

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

November 1924 The Radio Trade Directory advertisement page 107tbn_usa_coto_coil_symphonic_november_1924_radio_trade_directory_page_107.jpg
September 1922 Radio Broadcast advertisementtbn_usa_coto_coil_ad_set1922radiobroadcast.jpg

  

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