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发明名称
FREQUENCY INDICATING AND CONTROL APPARATUS
摘要
申请公布号
CA320180(A)
申请公布日期
1932.03.01
申请号
CAD320180
申请日期
申请人
THE HAMMOND COMPANY OF CANADA LIMITED
发明人
LAURENS HAMMOND
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主分类号
代理机构
代理人
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