Invention Grant
- Patent Title: Continuous miner with automatic roof support
- Patent Title (中): 连续采矿机具有自动屋顶支撑
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Application No.: US73922758Application Date: 1958-06-02
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Publication No.: US2904319APublication Date: 1959-09-15
- Inventor: NEWTON JOHN S
- Applicant: GOODMAN MFG CO
- Assignee: Goodman Mfg Co
- Current Assignee: Goodman Mfg Co
- Priority: US73922758 1958-06-02
- Main IPC: E21C27/12
- IPC: E21C27/12 ; E21D17/00 ; E21D20/00
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