earth moving, building, loading and lifting machine parts, namely quick-change couplings, add-on units, namely interchangeable loading, lifting and multi-purpose components for loading, lifting and earth moving and building machines, namely excavator shovels, rear digging buckets, backhoe dippers, shovel buckets, rock backhoe dippers, trapezoidal buckets, deep-working backhoe buckets, ditch cleaning shovels, ditch profiling shovels, drainage buckets, ejector shovels, swing buckets, loading bu...