Invention Grant
- Patent Title: Recording speed-indicator.
- Patent Title (中): 记录速度指示器
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Application No.: US1905245514Application Date: 1905-02-13
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Publication No.: US849884APublication Date: 1907-04-09
- Inventor: BROWN RICHARD P
- Applicant: BROWN RICHARD P
- Assignee: Richard P Brown
- Current Assignee: Richard P Brown
- Priority: US1905245514 1905-02-13
Information query
