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发明名称
Spot board
摘要
申请公布号
US1801112(A)
申请公布日期
1931.04.14
申请号
US19280281836
申请日期
1928.05.31
申请人
WILLIAM SCHULTZ;ALLEN SCHULTZ JAMES
发明人
SCHULTZ WILLIAM;SCHULTZ JAMES ALLEN
分类号
E01B35/02
主分类号
E01B35/02
代理机构
代理人
主权项
地址
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