7 paper pulp producing and handling machines; namely, digesters, mixers, pumps, screens, washers, degassers, bleachers, delignifiers, feed chests, air locks, low and high pressure feeders, steaming vessels, chutes, top and sand separators, in-line drainers, impregnation vessels, air/water separators, evaporators, steam mixers, dischargers and diffusers