Airco Welder info?

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I have searched the Internet high & low for any info on this welder but have had no luck.I'm pretty sure it's an older Rebadged Miller. The Panel label say's Airco D- IV Heliwelder - Stock # 1350 - 1132 / Serial # HF 856114.It is powered by a Perkins Diesel.The previous owner wrote on the inside cover Model 44 D.Miller Trailblazer Model # 901794.It ran well when I got it but it had a slight flicker that smoothed out after starting.I may have a bad brush or so. The machines hour meter reads 3800 + hrs.In my area we get a lot of Mud Dauber wasps & they sometimes build on the slip rings.That's most likely what happened to my Bobcat which I was able to fix fairly easily.It runs & powers just fine now.Any info or leads on the Airco would be greatly appreciated.                                                                                         G.BudziakMiller Mig 130 & Bobcat 225GOx / LP Gas Hatchet9" x 20"  LatheShp Tsk Mill / Drill / Lathe5/8" Bench top Drill PressPlastic WelderMisc. Mech, Machinist, & Metalworking ToolsLongevity FC 500 Plasma Cutter