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http://www.google.co.uk/patents/US3579394?utm_source=gb-gplus-share
Patent US3579394 - SOFT GROUND ETCHING METHOD
SOFT GROUND ETCHING METHOD
Robert F. Nelson et al
› Overview
Abstract
Drawings
Description
Claims
Patent number
: 3579394
Filing date
: 31 Jan 1968
Issue date
: 18 May 1971
Inventors
:
Robert F. Nelson
,
Robert F. Nelson
Current U.S. Classification
:
216/44
;
216/100
View patent at USPTO
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Referenced by
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Original Assignee
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Drawings
Drawings
