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发明名称
Draft control
摘要
申请公布号
US2221750(A)
申请公布日期
1940.11.19
申请号
US19370167350
申请日期
1937.10.05
申请人
SERVEL, INC.
发明人
ASHBY CARL T.;HAYNE RALPH B.
分类号
F25B33/00
主分类号
F25B33/00
代理机构
代理人
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地址
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