BulbCollector Forums
BULB DISCUSSION BOARDS => Antique Bulb Discussion => Topic started by: grg99 on May 21, 2010, 08:29:06 am
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While digging through a box of old tubes I found this unusual bulb:
Clear slightly elongated (looks like a 280 tube)
Regular Base.
Sticker on it says "Pat 6,4,02" "Pat 6,3,03"
large 2.5 turn filament, very floppy, no supports.
tiny inner filament (broken off )
small switch on base, I assume to turn on either filament, with safety-wire holes.
Any Idea who made it and what it might be worth?
Thanks,
George
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