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发明名称
Plumb bob with magnetic point
摘要
申请公布号
US2523351(A)
申请公布日期
1950.09.26
申请号
US19460648444
申请日期
1946.02.18
申请人
GUNNAR O. BEDOAR
发明人
ARMSTRONG CHARLES
分类号
G01C15/10
主分类号
G01C15/10
代理机构
代理人
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