Air compressors, namely, positive displacement compressors including reciprocating compressors [ and rotary compressors ] such as piston compressors, [ in-line compressors, V-shaped compressors, tandem piston compressors, single-acting compressors, double-acting compressors, diaphragm compressors, screw compressors, vane type compressors, lobe and scroll compressors; air compressors, namely, roto-dynamic compressors such as centrifugal compressors, axial flow compressors, ] parts for air comp...