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1892994
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Information
Patent Grant
1892994
References
Source
Patent Number
1,892,994
Date Filed
Not available
Date Issued
Tuesday, January 3, 1933
91 years ago
CPC
E21C37/22 - Hand tools or hand-held power-operated tools specially adapted for dislodging minerals
US Classifications
173 - Tool driving or impacting
299 - Mining or in situ disintegration of hard material
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