Invention Grant
- Patent Title: Door-operating device.
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Application No.: US1910563862Application Date: 1910-05-28
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Publication No.: US993941APublication Date: 1911-05-30
- Inventor: ALTER CHRISTIAN
- Applicant: ALTER CHRISTIAN
- Assignee: Christian Alter
- Current Assignee: Christian Alter
- Priority: US1910563862 1910-05-28
Information query
