43 10 00 Gas Handling Equipment
43 12 00 Gas Compressors
43 12 11 Centrifugal Compressors 43 12 13 Diagonal or Mixed-flow Compressors 43 12 16 Axial-flow Compressors 43 12 33 Single-acting Reciprocating Compressors 43 12 34 Double-acting Reciprocating Compressors 43 12 37 Diaphragm Reciprocating Compressors 43 12 51 Rotary Screw Compressors 43 12 53 Rotary Vane Compressors 43 12 56 Rotary Liquid-ring Compressors 43 12 57 Rotary Scroll Compressors