Invention Grant
- Patent Title: Focusing finder
- Patent Title (中): 聚焦取景器
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Application No.: US19322027Application Date: 1927-05-21
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Publication No.: US1796725APublication Date: 1931-03-17
- Inventor: ROSS OSCAR A
- Applicant: ROSS OSCAR A
- Assignee: Oscar A Ross
- Current Assignee: Oscar A Ross
- Priority: US19322027 1927-05-21
- Main IPC: G03B19/18
- IPC: G03B19/18
Information query
