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3904247
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Patent Grant
3904247
References
Source
Patent Number
3,904,247
Date Filed
Not available
Date Issued
Tuesday, September 9, 1975
48 years ago
CPC
E21C27/44 - Planing knives
Y10T403/7015 - Assembled by plural manipulations of member
US Classifications
299 - Mining or in situ disintegration of hard material
037 - Excavating
175 - Boring or penetrating the earth
403 - Joints and connections
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