Invention Grant
- Patent Title: Door operating mechanism
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Application No.: US74020734Application Date: 1934-08-17
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Publication No.: US2006082APublication Date: 1935-06-25
- Inventor: BANCROFT JAMES E
- Applicant: RICHMOND FIREPROOF DOOR COMPAN
- Assignee: Richmond Fireproof Door Compan
- Current Assignee: Richmond Fireproof Door Compan
- Priority: US74020734 1934-08-17
- Main IPC: E05F15/16
- IPC: E05F15/16
Information query
