Process of making negatives in metal of solid objects or surfaces

申请公布号：US2258452(A)

申请号：US19400316583

申请日期：1940.01.31

申请公布日期：1941.10.07

申请人：

METALLIZING ENGINEERING COMPANY, INC.

发明人：INGHAM HERBERT S.;SHEPARD ARTHUR P.

分类号：B22C9/06;C23C4/18

主分类号：B22C9/06

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