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1847136
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Information
Patent Grant
1847136
References
Source
Patent Number
1,847,136
Date Filed
Not available
Date Issued
Tuesday, March 1, 1932
92 years ago
CPC
E21B25/00 - Apparatus for obtaining or removing undisturbed cores
B25D17/08 - Means for retaining and guiding the tool bit
E01C23/0926 - with power-driven tools
Y10T83/2122 - By ejector within a hollow cutter
US Classifications
175 - Boring or penetrating the earth
073 - Measuring and testing
083 - Cutting
125 - Stone working
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