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发明名称
Photosensitive means for controlling leveling and grading apparatus and establishing reference levels
摘要
申请公布号
US3242340(A)
申请公布日期
1966.03.22
申请号
US19630257906
申请日期
1963.02.12
申请人
LAYNE MELVIN E
发明人
LAYNE MELVIN E.
分类号
G01C15/00
主分类号
G01C15/00
代理机构
代理人
主权项
地址
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