Invention Grant
- Patent Title: Manufacture of resilient springs
- Patent Title (中): 弹性弹簧的制造
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Application No.: US23226538Application Date: 1938-09-29
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Publication No.: US2208052APublication Date: 1940-07-16
- Inventor: PIERCE ROBERT C
- Applicant: NAT STANDARD CO
- Assignee: Nat Standard Co
- Current Assignee: Nat Standard Co
- Priority: US23226538 1938-09-29; US7484436 1936-04-17
- Main IPC: B21F33/00
- IPC: B21F33/00
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