Loading and unloading machines in the nature of motorized roller conveyors, free roller conveyors, chain conveyors, belt conveyors, and plastic belt conveyors; loading and unloading machine parts, namely conveyor belts, reel rollers, chain gears, and belt angle gears, other than for land vehicles; machine elements not for land vehicles, namely, turntables and their rotating devices; swivel tables being parts of conveyor machines and other loading and unloading machines, which swivel trays and pallets used with those machines; pushing machines, namely, pusher for pushing trays and pallets onto or between conveyors and other loading and unloading machines; metal working machines, namely, machining centers; centrifugal separators; elevators; elevating devices in the nature of elevating work platforms; reverse osmosis pumps; industrial machine presses and machines in the nature of pallet loaders; straightening machines, namely, squaring machines for straightening items on conveyors and other loading and unloading machines; swivel crosses being parts of conveyor machines and other loading and unloading machines allowing rotation of a palletized or non-palletized load at 90° or 180°; stack straightening machines, namely, machines for straightening stacks of items on conveyors machines and other loading and unloading machines; cart racks, namely, parts of conveyors and other loading and unloading machines, where items are placed before and after use on conveyors machines and other loading and unloading machines; loading bridges, namely, ramps for loading items onto conveyors and other loading and unloading machines; machine parts in the nature of shuttles, namely parts of machines for moving loads of any size, palletized or not, on straight paths; lifting tables, namely, lifting work platforms; protection distributors, namely parts of machines ensuring the automatic insertion of one or more protection plates under cardboard piles at the same time, these plates protecting the cardboard piles during strapping; automatic pallet, sheet and plate dispensing machines for use with conveyors and other loading and unloading machines; pressing plates, namely parts of machines ensuring the maintenance of the palletized load during the phase of rotation of the pallet