12 Coupling systems, namely, couplings for land vehicles for connection to pipes and media; Quick-change devices and attachments therefor for land vehicles, namely, shears, concrete crushers, pulverisers, mixers, sieves, vibrators, compressors, milling cutters, cutters, chaff cutters, stone laying equipment, excavator buckets, rear loader buckets, backhoe buckets, face buckets, rock buckets, trapeze buckets, ripping buckets, ditch-clearing buckets, ditch profile buckets, drainage buckets, ejector buckets, tilt buckets, excavator shovels, loader shovels, demolition shovels, rock loader shovels; Quick-change devices and attachments therefor for land vehicles, namely, grippers, hammer tools, concrete shears, drills, demolition tools, concrete repair tools, demolition equipment, concrete repair equipment, demolition arms, rock pincers, hoisting equipment, ripping teeth and uprooter; Couplings for land vehicles; Machine couplings and transmission components for land vehicles; Hydraulic connectors for use with hydraulic systems for land vehicles; Hydraulic couplings for use with hydraulic systems for land vehicles