7 Lifting systems, namely, lifting systems for lifting and handling heavy loads, namely, chain jacks, namely, linear chain jacks, namely, hydraulically powered linear chain jacks; lifting systems for use at shipyards, namely, lifting systems for lifting ships, namely, shiplifts; lifting systems for constructions projects, namely, lifting systems composed of hydraulically powered jacks for lifting prefab structures for construction projects; lifting systems composed of hydraulically powered jacks for use on offshore vessels