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1933589
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Information
Patent Grant
1933589
References
Source
Patent Number
1,933,589
Date Filed
Not available
Date Issued
Tuesday, November 7, 1933
91 years ago
CPC
E21C25/66 - Machines for making slits with additional arrangements for drilling
Y10T74/173 - Screw and nut adjusting means
Y10T408/6771 - with clutch means
US Classifications
074 - Machine element or mechanism
173 - Tool driving or impacting
175 - Boring or penetrating the earth
192 - Clutches and power-stop control
408 - Cutting by use of rotating axially moving tool
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