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发明名称
PROJECTION READER
摘要
申请公布号
US3502406(A)
申请公布日期
1970.03.24
申请号
USD3502406
申请日期
1966.07.19
申请人
CONSOLIDATED EDUCATIONAL PUBLISHING INC.
发明人
JAMES KEITH MACOMBER
分类号
G03B21/00;G09B17/04;(IPC1-7):G03B21/10
主分类号
G03B21/00
代理机构
代理人
主权项
地址
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