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3898454
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Information
Patent Grant
3898454
References
Source
Patent Number
3,898,454
Date Filed
Not available
Date Issued
Tuesday, August 5, 1975
48 years ago
CPC
G01L9/0088 - using photoelectric means
G01D5/34 - the beams of light being detected by photocells
US Classifications
250 - Radiant energy
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