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发明名称
Apparatus for forming helical plow screws
摘要
申请公布号
US2280847(A)
申请公布日期
1942.04.28
申请号
US19400345128
申请日期
1940.07.12
申请人
PITCHER MILES H
发明人
PITCHER MILES H.
分类号
B21F3/06
主分类号
B21F3/06
代理机构
代理人
主权项
地址
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