Invention Grant
- Patent Title: Safety-gate.
- Patent Title (中): 安全门。
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Application No.: US1901051640Application Date: 1901-03-18
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Publication No.: US735306APublication Date: 1903-08-04
- Inventor: SIMPSON CHARLES E
- Applicant: SIMPSON CHARLES E
- Assignee: Charles E Simpson
- Current Assignee: Charles E Simpson
- Priority: US1901051640 1901-03-18
Information query
