Invention Grant
- Patent Title: Earth strata-hardness responsive means
- Patent Title (中): 地层硬度响应手段
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Application No.: US77277058Application Date: 1958-11-10
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Publication No.: US3056952APublication Date: 1962-10-02
- Inventor: HEIMASTER JOHN W , MILLER JOHN R
- Applicant: UNION CARBIDE CORP
- Assignee: Union Carbide Corp
- Current Assignee: Union Carbide Corp
- Priority: US77277058 1958-11-10
- Main IPC: E02D1/02
- IPC: E02D1/02 ; G01V9/00
Information query
