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Balloon Envelope Radio Valve, 20th Century
Inventory Number: 92020
Date: 20th Century
Maker Details: Unknown
Inscription: None
Size: 115 mm in overall length (including base pins)
Materials: Glass, steel, bakelite, assorted metals.
Notes:
Radio Valve (or Tube) with partially darkened glass balloon envelope, polished black bakelite base and four steel base pins.
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