Invention Grant
- Patent Title: Folding stairs
- Patent Title (中): 折叠楼梯
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Application No.: US32828252Application Date: 1952-12-29
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Publication No.: US2743861APublication Date: 1956-05-01
- Inventor: GEORGE MATTIS , STANLEY RAPP
- Applicant: MATTIS
- Assignee: Mattis
- Current Assignee: Mattis
- Priority: US32828252 1952-12-29
- Main IPC: E04F11/04
- IPC: E04F11/04 ; E06C1/387 ; E06C9/08
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