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发明名称
Improvements in or relating to chart table protractor instruments and similar devices
摘要
申请公布号
GB649815(A)
申请公布日期
1951.01.31
申请号
GB19480033381
申请日期
1948.12.29
申请人
KELVIN & HUGHES LIMITED
发明人
CROMPTON HOWARD ERIC
分类号
B43L9/00;G01C21/20
主分类号
B43L9/00
代理机构
代理人
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地址
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