Invention Grant
- Patent Title: Portable window fire-escape ladder.
- Patent Title (中): 便携式WINDOW FIRE-ESCAPE LADDER。
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Application No.: US1906298845Application Date: 1906-01-31
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Publication No.: US857440APublication Date: 1907-06-18
- Inventor: CAMPBELL DAVID NEWTON E
- Applicant: CAMPBELL DAVID NEWTON E
- Assignee: David Newton E Campbell
- Current Assignee: David Newton E Campbell
- Priority: US1906298845 1906-01-31
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