Rock-drill bit.

Invention Grant

US786952A Rock-drill bit. 失效

Title translation: 钻石钻头

Patent Title: Rock-drill bit.
Patent Title (中): 钻石钻头
Application No.: US1904195474

Application Date: 1904-02-26
Publication No.: US786952A

Publication Date: 1905-04-11
Inventor: CLARK SAMUEL B
Applicant: JOHN WILLIAM GRAHAM JR , STEPHEN GILBERT SHAW , CLARK SAMUEL B
Assignee: John William Graham Jr,Stephen Gilbert Shaw,Samuel B Clark
Current Assignee: John William Graham Jr,Stephen Gilbert Shaw,Samuel B Clark
Priority: US1904195474 1904-02-26

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