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发明名称
Demonstrating device
摘要
申请公布号
US2419658(A)
申请公布日期
1947.04.29
申请号
US19450592683
申请日期
1945.05.08
申请人
GULF OIL CORPORATION
发明人
ROGERS HIRAM M.
分类号
G09B25/02
主分类号
G09B25/02
代理机构
代理人
主权项
地址
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