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发明名称
Projection system, especially for teaching machines
摘要
申请公布号
US3305942(A)
申请公布日期
1967.02.28
申请号
US19630282750
申请日期
1963.05.23
申请人
MAST DEVELOPMENT CO.
发明人
MAST GIFFORD M.;TAYLOR WESLEY A.;GANNETT WRIGHT K.
分类号
G03B21/00;G09B5/02
主分类号
G03B21/00
代理机构
代理人
主权项
地址
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