34 AIR CURTAIN EQUIPMENT PROVIDING A FORCED FLOW OF TEMPERATURE-CONTROLLED AIR ACROSS AN ACCESS OPENING TO A WORK SPACE, COMPRISING AIR HEATING AND COOLING EQUIPMENT, BLOWERS, DUCTWORK AND CONTROLS
Trademark Events
Dec 7, 1992
Expired Sec. 9
Aug 29, 1977
Registered - Sec. 8 (6-Yr) Accepted & Sec. 15 Ack.