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发明名称
SAFETY DROP DOOR HOOK
摘要
申请公布号
CA319416(A)
申请公布日期
1932.02.02
申请号
CAD319416
申请日期
申请人
RICHARD D. SMITH
发明人
RICHARD D. SMITH
分类号
主分类号
代理机构
代理人
主权项
地址
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