3d printers, 3d printing pens, acetylene cleaning apparatus, adhesive bands for pulleys, adhesive tape dispensers [machines], aerating pumps for aquaria, aerocondensers, aeronautical engines, aeroplane engines, agitators, agricultural elevators, agricultural implements, other than hand-operated, agricultural machines, air brushes for applying colour, air condensers, air cushion devices for moving loads, air pumps [garage installations], air suction machines, alternators, anti-friction bearing...