Invention Grant
- Patent Title: Demonstration device
- Patent Title (中): 演示装置
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Application No.: US28453563Application Date: 1963-05-31
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Publication No.: US3208161APublication Date: 1965-09-28
- Inventor: ISAY BALINKIN
- Applicant: ISAY BALINKIN
- Assignee: Balinkin Isay
- Current Assignee: Balinkin Isay
- Priority: US28453563 1963-05-31
- Main IPC: G09B23/22
- IPC: G09B23/22
Information query
