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Amperex
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DeForest
Delta Midget
Duovac
Donle
Eimac
Electrad
Emerson
General Electr.
Haydu Brothers
Heintz + Kaufm.
Hughes
Hytron
IEE
Kellogg
KenRad
Lewis + Kaufm.
Magnavox
Marathon
Mc.Candless
McCullough
Moorhead
Myers
Nat.-Electr.
Nat.-Union
Raytheon
RCA
Rogers
Schickerling
Sylvania
Taylor
TungSol
Vac-O-bub
Varian
Weagant
Western Electr.
Westinghouse