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Description
Glass tube, likely hand-blown, with la 7" stem and two 1" diameter discs on a semi-circle. No metal contacts. No identifying marks.
Type
image
Identifier
C460C313-B2B5-4D71-861E-134779952318 2003-1-874
Subject
Vacuum-tubes Nineteen twenties Diathermy Medical equipment & supplies Medical electronics Medical instruments and apparatus Nineteen tens Electrotherapeutics
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