Invention Grant
- Patent Title: Foldable ladder and hinge members therefor
- Patent Title (中): 可折叠的梯子和铰链部件
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Application No.: US4177648Application Date: 1948-07-31
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Publication No.: US2662681APublication Date: 1953-12-15
- Inventor: STAPLETON BRUCE E
- Applicant: STAPLETON BRUCE E
- Assignee: Bruce E Stapleton
- Current Assignee: Bruce E Stapleton
- Priority: US4177648 1948-07-31
- Main IPC: E06C1/52
- IPC: E06C1/52
Information query
