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hi there,according to the enclosed pic, they are 3 micas, gray plates, horseshoe (or disc?) getter and yellow printing; i've no idea about the letters LK and JDB; any help about year of manufacturing?
best, paco
Edits: 10/23/14
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Topic - please help identifying Sylvania 5751 - paco 01:55:06 10/23/14 (0)