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发明名称
Magnetic-field-operable changeable symbol system
摘要
申请公布号
US3229281(A)
申请公布日期
1966.01.11
申请号
US19630268034
申请日期
1963.03.26
申请人
MAGNETOSCOPICS INC.
发明人
HACKENFORT ROBERT
分类号
G08B5/22
主分类号
G08B5/22
代理机构
代理人
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地址
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