Title:
Engraving process
United States Patent 2177751
Inventors:
Sikorski, Edward A.
Publication Date:
10/31/1939
Export Citation:
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Assignee:
GEN CHEMICAL CORP
Primary Class:
252/79.4
Other Classes:
29/423, 216/108, 252/193
International Classes:
C23F1/16; C23F1/10
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