1980s-1990s; Advance Machine Company – Plymouth, MN The Advance Whirlamatic 20 is a heavy-duty corded rotary floor buffer engineered for commercial and industrial maintenance. Equipped with a 20 pad driver, this unit delivers consistent rotational scrubbing action suitable for polishing, stripping, and resurfacing a variety of hard floor surfaces. The unit incorporates a direct-drive motor mounted in a cast housing, designed for torque stability and extended service life. The upright handlebar includes dual grips with integrated safety interlock controls, ensuring operator stability and preventing accidental start-up. A reinforced steel frame connects the motor housing to the upright column, while dual rear transport wheels allow tilt-back mobility when not in operation. Power is supplied through a heavy-gauge cord designed for long-run use in commercial settings. Key Specifications (typical Whirlamatic 20 models). Cleaning path / pad diameter: 20 in (51 cm). Motor: 1.5 HP, single-phase electric. Pad speed: 1,500 rpm (UHS / “Plus”). For “Ultra” variant: 2,000 rpm. Power cord: 75 ft (23 m) cord standard in many refurb models. Work rate / coverage: 10,000 sq ft/hr (? 930 m²/hr) for 20 UHS / Plus models. Pad pressure control: gas-shock or Constant-Flo / torsion spring mechanism to maintain even downward force. Dust control / enclosure: enclosed pad chamber + dust shroud or ported exhaust systems in many models. Construction: molded polyethylene base, extruded aluminum or steel handle, nonmarking transport wheels. Net weight (w/ cord): 92 lb (? 43 kg) in some refurbished units. Dimensions (L × W × H): 32? × 25? × 49? In reconditioned units Operational / Design Highlights. Direct-drive motor to pad eliminates belts and pulleys for simpler maintenance. The gas-shock or Constant-Flo torsion system ensures consistent pad pressure even on uneven floors. Flexible pad holder allows full pad contact across floor variances. Nonmarking wheels and tip-back transport capability for ease of movement. Founded in 1928, Advance Machine Company became a leader in industrial cleaning systems, later merging with Nilfisk to expand its range of floor care technology worldwide. Unit shows typical wear from service including surface scuffs, paint loss, and cord use, but powers on and functions as intended. 20″ W x 23″ L x 48 H MM – C-16005 – 092625.