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发明名称
Instructional desk
摘要
申请公布号
US3077038(A)
申请公布日期
1963.02.12
申请号
US19580766542
申请日期
1958.10.10
申请人
WILLIAMS RESEARCH CORPORATION
发明人
WILLIAMS SAM B.;JR. GEORGE T. BURTON,
分类号
G09B7/06
主分类号
G09B7/06
代理机构
代理人
主权项
地址
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