Rare early Air Techniques M5 portable oil-less dental compressor in original case. Tested unit powers on, runs smoothly, and builds pressure. Features: Model M5 Serial #367 (early production) 1 HP, 115V, 15A U.S. Patent 3,399,520 Manufactured by Jelrus Tech Products Corp., New Hyde Park, NY Original tank, gauge, fittings, and case included Vintage late-1960s/early-1970s medical/dental equipment with collector appeal.