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http://www.google.com/patents/US3798409?utm_source=gb-gplus-share
Patent US3798409 - FUME EXTRACTING WELDING GUN NOZZLE
FUME EXTRACTING WELDING GUN NOZZLE
Troyer; Leo E. Wildenthaler et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3798409
Filing date
: Sep 22, 1971
Issue date
: 1974
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