Couplings for machines; couplings other than for land vehicles; machine coupling and transmission components, except for land vehicles, and parts therefor; power transmission parts other than for land vehicles; transmissions for machines; transmissions, other than for land vehicles; conveyors and conveyors belts; belt conveyors; conveyors being machines; transportation machines, namely, roller conveyors; unmanned transportation conveyors, namely, roller conveyors