Invention Grant
- Patent Title: Door-opener.
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Application No.: US1906334573Application Date: 1906-09-14
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Publication No.: US839330APublication Date: 1906-12-25
- Inventor: STEPHENSON JOHN M
- Applicant: STEPHENSON JOHN M
- Assignee: John M Stephenson
- Current Assignee: John M Stephenson
- Priority: US1906334573 1906-09-14
Information query
