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BULB DISCUSSION BOARDS => Antique Bulb Discussion => Topic started by: grg99 on May 21, 2010, 08:29:06 am

Title: Help ID "ECONOMICAL" bulb
Post by: grg99 on May 21, 2010, 08:29:06 am

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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