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发明名称
Depository
摘要
申请公布号
US1771332(A)
申请公布日期
1930.07.22
申请号
US19270167690
申请日期
1927.02.12
申请人
JOHNSTON JAMES R
发明人
JOHNSTON JAMES R.
分类号
E05G1/00
主分类号
E05G1/00
代理机构
代理人
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