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发明名称
Spring
摘要
申请公布号
US1917486(A)
申请公布日期
1933.07.11
申请号
US19310527467
申请日期
1931.04.03
申请人
WILLIAM BECK
发明人
BECK WILLIAM
分类号
F03G1/00
主分类号
F03G1/00
代理机构
代理人
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