7 Drive and conveyor chains for stationary and driveable machines, other than for land vehicles, and parts therefor; parts of machines in the nature of metal driving chains, other than for land vehicles, in particular planing chains; apparatus and equipment in the nature of machines for gripping, lifting, transporting, conveying, handling, assembling, rotating, turning, lowering, stacking, lashing and loading loads; parts specially adapted for machines for gripping, lifting, transporting, conveying, handling, assembling, rotating, turning, lowering, stacking, lashing and loading loads, in particular lifting suspension gear in the nature of cables for lifts, lifting harnesses, gripping harnesses, chain suspension gear in the nature of chains for conveyors, isolating slings, magnet suspension gear in the nature of cables for lifts, toggle chains, endless chains, load harnesses, crane crossbeams, crane hook crossbeams and crane forks; parts of machines, namely, chain wheels and chain wheel bearings; conveyors, in particular chain conveyors, discharge conveyors, trough chain conveyors, continuous conveyors, steel plate conveyors, bucket conveyors and parts for the aforesaid goods; conveyor accessories as parts of machines, namely, carriers, scrapers, roller tracks for use in roller conveyor apparatus, rollers and wheels for conveyor machines, machine wheels, chucks, and tensioning apparatus in the nature of jack screw specially adatped for adjusting the tension of a conveyor belt; drive motors and gears for conveyors; drive and conveyor chains for stationary and driveable machines, other than for land vehicles, with sensors, in particular with sensors for measuring transmission and wear