(t)"Openers and pickers" means a general classification of machinery which includes breaker pickers, intermediate pickets, finisher pickers, single process pickers, multiple process pickers, willow machines, card and picker waste cleaners, thread extractors, shreeding machines, roving waste openers, shoddy pickers, bale breakers feeders, vertical openers, latice cleaner, horizontal cleaners and any similar machinery equipped with either cylinders, screen section, calendar section, rolls, or beaters used for the preparation of stock for further processing.