Invention Grant
- Patent Title: Oil-conserving piston
- Patent Title (中): 节油活塞
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Application No.: US45180030Application Date: 1930-05-12
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Publication No.: US1796792APublication Date: 1931-03-17
- Inventor: JOHNSON CHARLES E
- Applicant: JOHNSON CHARLES E
- Assignee: Charles E Johnson
- Current Assignee: Charles E Johnson
- Priority: US45180030 1930-05-12
- Main IPC: F16J1/08
- IPC: F16J1/08
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