发明名称 |
System for positioning photographic transparencies correctly for projecting uses marks or cut-away corners on transparency frames |
摘要 |
The system consists of marks (2) such as numerals in the corners of the transparency frame (1) which enable the user to insert the transparencies in a holder the right way up for projecting onto a screen. The corners of the frame can also be scored to allow one or more to be detached to indicate the correct position of the transparency.
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申请公布号 |
FR2815431(A1) |
申请公布日期 |
2002.04.19 |
申请号 |
FR20000013346 |
申请日期 |
2000.10.16 |
申请人 |
CROCY JEAN LOUIS |
发明人 |
CROCY JEAN LOUIS |
分类号 |
G03B21/64;(IPC1-7):G03B21/64 |
主分类号 |
G03B21/64 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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