Invention Grant
- Patent Title: Releasing spear
- Patent Title (中): 释放矛
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Application No.: US54281231Application Date: 1931-06-08
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Publication No.: US1842705APublication Date: 1932-01-26
- Inventor: ERNEST WILKINSON
- Applicant: LESLIE A LAYNE
- Assignee: Leslie A Layne
- Current Assignee: Leslie A Layne
- Priority: US54281231 1931-06-08
- Main IPC: E21B31/20
- IPC: E21B31/20
Information query
