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History of the manufacturer  

Sangamo Electric Co.; Springfield (IL)

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Name: Sangamo Electric Co.; Springfield (IL)    (USA)  
Abbreviation: sangamo

Sangamo Electric Corporation, Springfield (IL).
Manufacturer of electric meters, electronic components (mica capacitors) and radios.

Founded: 1899
Sangamo Electric Corporation was founded in 1899 by Jacob Bunn (1864-1926), Henry Bunn, Ludwig Gutmann and co-founder Robert Carr Lanphier (1878-I939).
Sangamo started with manufacturing of electric meters, later of electronic components (mica capacitors), and aircraft receivers to be used in WWI.

Some models:
Country Year Name 1st Tube Notes
USA  25 7 tubes   One dial (primary tuning control knob). 
USA  26 Mica Condenser   Various capacities from 0.00004 to 0,0015 microfarads. Prices from $0.40 to $1.25. ... 
USA  30 Portable Watthour Meter Type F   Elmenco fused plug. 


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

Early oval Sangamo logotbn_usa_sangamo_logo.jpg
Radio Broadcast, Mar. 1926, p. 615tbn_usa_sangamo.jpg