Invention Grant
- Patent Title: Mechanical door opener and closer for overhead doors
- Patent Title (中): 机械开门器和靠近门架的门
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Application No.: US59155932Application Date: 1932-02-08
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Publication No.: US2023909APublication Date: 1935-12-10
- Inventor: WREAD WILLIAM E
- Applicant: SPENCER F WREAD
- Assignee: Spencer F Wread
- Current Assignee: Spencer F Wread
- Priority: US59155932 1932-02-08
- Main IPC: E05D15/24
- IPC: E05D15/24
Information query
