Item Details Tweco® Spray Master® Series 250 A MIG Gun with heavy-duty contact tip accommodates wires sizes of 0.035 - 0.045" and has ergonomic handle design that reduces welders fatigue. Air-cooled MIG gun is ideal for spray as well as pulse welding applications and features simplified direct rear plug for easy installation. 15' Cable MIG gun incorporating standard 60 deg conductor tube offers to swivel 360 deg around handle and can be rapidly removed and replaced without removing the conduit.
I googled the patent number and found the following info. The figures on the patent sketches looks slightly different than the piece. Patent number: US 3497806
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