Coherer: Telefunken type, made by Gesellschaft Fur Drahltose Telegraphie in Germany circa 1905. Used by donor about 1905-06. Not the first commercial form.

Physical Description

Consists of evacuated tube with electrodes, possibly aluminium and silver, with gold filings between. End caps of metal. Glass pinch off. Multiple registration numbers physically joined. This object is physically attached to a display board with ST 21766.

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