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Small miniature incandescent light bulb with clear glass dome and threaded brass base. The bulb contains a visible tungsten filament and traces of sil

Circular metal microphone capsule consisting of a perforated front grill and threaded metal casing with a textured lower section for grip. The top sur

Cylindrical glass vacuum tube with metal interior components and five metal connection pins at the base. The glass envelope is slightly darkened at th

Small black bakelite radio valve (vacuum tube) component with six metal pins and cylindrical housing. The exterior bears the Westinghouse Radiotron lo