发明名称 |
Changeable character sign structure |
摘要 |
Sign having self-storing characters which are quickly changeable. The face of the sign has a patterned array of openings juxtaposed against a contrasting background. The background may be supplied by color contrast and/or by illumination.
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申请公布号 |
US4164824(A) |
申请公布日期 |
1979.08.21 |
申请号 |
US19780924624 |
申请日期 |
1978.07.14 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
NIDELKOFF, JAMES G. |
分类号 |
G09F9/37;(IPC1-7):G09F9/32 |
主分类号 |
G09F9/37 |
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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