power driven hand tools, namely, pneumatic drills, pneumatic hammers, grinders, sanders, taps, electric drills, electric hammers, screwdrivers, nut runners, buffers, polishers, wrenches and machine operated jacks; separators for selective physical separation of mixed solids; solids-liquid separators; pumps; namely, centrifugal pumps, reciprocating pumps, rotary pumps, axial flow pumps, mixed flow pumps, vacuum pumps, reciprocating vacuum pumps, rotary vacuum pumps and diffuser pumps; reciproc...