Invention Grant
- Patent Title: Door-check.
- Patent Title (中): 门检
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Application No.: US1911644192Application Date: 1911-08-15
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Publication No.: US1028850APublication Date: 1912-06-11
- Inventor: ASPEGREN WILLIAM H
- Applicant: ASPEGREN WILLIAM H
- Assignee: William H Aspegren
- Current Assignee: William H Aspegren
- Priority: US1911644192 1911-08-15
Information query
