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发明名称
CHANGE SPEED DEVICE
摘要
申请公布号
CA386906(A)
申请公布日期
1940.02.13
申请号
CAD386906
申请日期
申请人
HOWARD A. PATTERSON
发明人
JESSE W. HALE
分类号
主分类号
代理机构
代理人
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