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发明名称
Drawbar-key safety device
摘要
申请公布号
US1756406(A)
申请公布日期
1930.04.29
申请号
US19250007648
申请日期
1925.02.07
申请人
VIBERG ERNEST R
发明人
VIBERG ERNEST R.
分类号
B61G9/20
主分类号
B61G9/20
代理机构
代理人
主权项
地址
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