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vintage sylvania semiconductor 348 4 2905 11 lot of 200 For Sale

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vintage sylvania semiconductor 348 4 2905 11 lot of 200:
$76.02

I got these from a gentlemen that passed away. He was an electronics teacher from 1960-1990 ish. This appears to be a brand new box unopened. I am not sure what these do or are used for zero reserve.

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