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发明名称
Ladder
摘要
申请公布号
US1829980(A)
申请公布日期
1931.11.03
申请号
US19280279250
申请日期
1928.05.21
申请人
BURGESS CLYDE B
发明人
BURGESS CLYDE B.
分类号
E06C1/20
主分类号
E06C1/20
代理机构
代理人
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