发明名称 |
Image mask for microfiche |
摘要 |
An image masking device for a microfilm reader and/or reader-printer is formed to slide longitudinally of a microfiche handler and comprises a thin opaque mask adapted to ride on the film handler adjacent a film to cover the film and define a clear line of demarcation between visible image portions and obscured portions.
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申请公布号 |
US4688911(A) |
申请公布日期 |
1987.08.25 |
申请号 |
US19860892244 |
申请日期 |
1986.07.31 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
SIMBAL, JOHN J. |
分类号 |
G03B21/11;(IPC1-7):G03B21/14 |
主分类号 |
G03B21/11 |
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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