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High emissivity filament for energy conserving incandescent lamps with infrared radiation returning envelopes
High emissivity filament for energy conserving incandescent lamps with infrared radiation returning envelopes
US Patent
4283653
· Granted Aug 11, 1981
Estimated economic value:
$373,000
ⓘ
Assignee
Duro-Test
Inventors
Jack Brett
(1 patents)
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