Chicago Miniature CM20-2 incandescent lamp, new old stock, tested and working. These unusual bulbs were intended for use as optical sensing units in early time lapse VCRs, and have a curved glass lens incorporated into their envelope. The lens exits the bulb at a 90 degree angle to the filament, which makes them ideal as colon indicators for clocks based around large numitron tubes like the DR2000 and IV-13.
Chicago Miniature CM20-2 lamp, normal operation.
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