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History of the manufacturer  

BARR; Washington, D.C.

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Name: BARR; Washington, D.C.    (USA)  
Abbreviation: barr
Products: Model types

The mailing address listed for BARR in various advertisements was Dept. E The Wyoming Washington, D.C.

This company advertised for several years a detector called "The BARR Mercury-Cup Detector.

This manufacturer was suggested by Alan Larsen.

Some models:
Country Year Name 1st Tube Notes
USA  16 Barr Mercury-Cup Detector   The Barr Mercury-Cup Detector instantly adjustable at a constant pressure.