Invention Grant
- Patent Title: Method of making engine poppet valves
- Patent Title (中): 制造发动机提升阀的方法
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Application No.: US20031038Application Date: 1938-04-06
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Publication No.: US2280686APublication Date: 1942-04-21
- Inventor: COLWELL ARCHIE T
- Applicant: THOMPSON PROD INC
- Assignee: Northrop Grumman Space and Mission Systems Corp
- Current Assignee: Northrop Grumman Space and Mission Systems Corp
- Priority: US20031038 1938-04-06
- Main IPC: B21H7/18
- IPC: B21H7/18
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