United States Patent 2732198

Publication Date:
01/24/1956
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Primary Class:
299/112R
Other Classes:
76/108.100
International Classes:
E21C35/183; E21C35/18; E21C35/00
US Patent References:
1908208Method of making cutting tools
2041346Method of making an abrasive cutting tool
2161062Percussion tool
2330081Mining machine bit
2483220Bit
Foreign References:
DE592580C
DE670880C