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发明名称
Stairway step
摘要
申请公布号
US1815126(A)
申请公布日期
1931.07.21
申请号
US19300419886
申请日期
1930.01.10
申请人
CHARLES L. WOOLDRIDGE, INC.
发明人
WOOLDRIDGE CHARLES L.
分类号
E04F11/025;E04F11/116
主分类号
E04F11/025
代理机构
代理人
主权项
地址
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