Invention Grant
- Patent Title: Offset core lifter apparatus
- Patent Title (中): OFFSET芯片装置
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Application No.: US3428138DApplication Date: 1967-03-22
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Publication No.: US3428138APublication Date: 1969-02-18
- Inventor: CASPER RAY K , LINDELOF LEONARD A
- Applicant: LONGYEAR CO E J
- Assignee: Longyear Co E J
- Current Assignee: Longyear Co E J
- Priority: US62512567 1967-03-22
- Main IPC: E21B25/12
- IPC: E21B25/12 ; E21B9/20 ; E21B25/00
Information query
