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摘要
申请公布号
US1838952(A)
申请公布日期
1931.12.29
申请号
US19280275585
申请日期
1928.05.07
申请人
MCDERMOTT HAROLD R
发明人
MCDERMOTT HAROLD R.
分类号
B28C7/08
主分类号
B28C7/08
代理机构
代理人
主权项
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