United States Patent 2732198
Publication Date:
01/24/1956
Export Citation:
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Primary Class:
299/112R
Other Classes:
76/108.1
International Classes:
E21C35/183; E21C35/18; E21C35/00
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US Patent References:
2483220Bit
2330081Mining machine bit
2161062Percussion tool
2041346Method of making an abrasive cutting tool
1908208Method of making cutting tools
1908161Coal-cutting chisel with hard metal cutting edge
1902513Method of making and hardening steel tools provided with hard metal members
1798229Process of making drill bits
1677055Diamond lathe tool
1497097Mining-machine bit
Foreign References:
DE592580C
DE670880C