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发明名称
Apparatus for assembling receptacle closures
摘要
申请公布号
US1875010(A)
申请公布日期
1932.08.30
申请号
US19300490402
申请日期
1930.10.22
申请人
JOHNSON JOHN A
发明人
JOHNSON JOHN A.
分类号
B21D51/46
主分类号
B21D51/46
代理机构
代理人
主权项
地址
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Speech valve for the trachea, which is simple to produce and prevents ingress of dust and insects
