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1933097
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Patent Grant
1933097
References
Source
Patent Number
1,933,097
Date Filed
Not available
Date Issued
Tuesday, October 31, 1933
91 years ago
CPC
H01J7/42 - Means structurally associated with the tube or lamp for indicating defects or previous use
US Classifications
315 - Electric lamp and discharge devices: systems
313 - Electric lamp and discharge devices
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