Metal air conditioning ducts; screws of metal; ventilating covers of metal being metal vent covers for HVAC ducts; heating ducts of metal being ducts of metal for central heating installations; metal door frames for refrigerating rooms; fittings of metal for compressed air lines being fittings of metal for compressed air hoses; pipes of metal, for central heating installations; ducts of metal for ventilating and air-conditioning installations; air-conditioning ducts of metal

high precision, air bearing rotary tables