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发明名称
Drop hammer board
摘要
申请公布号
US2158834(A)
申请公布日期
1939.05.16
申请号
US19370134062
申请日期
1937.03.31
申请人
RAYBESTOS-MANHATTAN, INC.
发明人
ROBINSON THOMAS
分类号
B21J7/36
主分类号
B21J7/36
代理机构
代理人
主权项
地址
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