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发明名称
Improvements relating to the construction and mounting of instruments for demonstration and instructional purposes
摘要
申请公布号
GB523173(A)
申请公布日期
1940.07.08
申请号
GB19380037574
申请日期
1938.12.28
申请人
PHILIP HARRIS AND COMPANY (1913) LIMITED;ARTHUR WATSON
发明人
分类号
G09B23/00
主分类号
G09B23/00
代理机构
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