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Old germanium diode.
An example of the element Germanium

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Old germanium diode.
Very pretty old germanium crystal diode.
Source: eBay seller 7538bruce
Contributor: Theodore Gray
Acquired: 17 April, 2008
Text Updated: 18 October, 2009
Price: $2.50
Size: 0.2"
Purity: 99.99%
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