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1456568
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Patent Grant
1456568
References
Source
Patent Number
1,456,568
Date Filed
Not available
Date Issued
Tuesday, May 29, 1923
101 years ago
CPC
H01K9/02 - to provide substitution in the event of failure of one of the bodies
US Classifications
315 - Electric lamp and discharge devices: systems
362 - Illumination
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