heavy, weighty / involving large-scale manufacture, heavy / great in degree, heavy, serious, severe, hard, difficult

weight

(Classical Japanese, archaic) to pile, add layers, stack, heap / (Classical Japanese, archaic) to repeat

heavy; important

transmission, a gearbox (a mechanical assembly of gears that changes the torque and speed of shaft rotations)

transporter, transportation machine.

experimental device; experimental equipment

Rube Goldberg machine

display

input device