duplex reciprocating pump 双筒往复泵 ; 双缸往复泵

duplex reciprocating compressor 双列往复压缩机

reciprocating duplex pump 往复式双缸泵

duplex acting steam-driven reciprocating pump 双作用蒸汽往复泵

duplex vertical reciprocating compressor 双缸立式往复压缩机

duplex tandem steam-driven reciprocating compressor 双列串联蒸汽驱动式往复压缩机

duplex four-cornered steam-driven reciprocating compressor 双列四缸对置式蒸汽驱动往复压缩机