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Plotting instrument

申请公布号:US2351769(A)

申请号:US19430481560

申请日期:1943.04.02

申请公布日期:1944.06.20

申请人:
CLAUDE R. WICKARD

发明人:KRAMER ALBERT J.

分类号:G01C21/20

主分类号:G01C21/20

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