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发明名称
CONVERTIBLE ELEVATOR
摘要
申请公布号
US3422506(A)
申请公布日期
1969.01.21
申请号
USD3422506
申请日期
1967.12.26
申请人
BYRON JACKSON INC.
发明人
JOHN W. TURNER JR.
分类号
E21B19/07;E21B19/10;(IPC1-7):A44B21/00;B66C1/22
主分类号
E21B19/07
代理机构
代理人
主权项
地址
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