<titlePart> <text>SECTION F <emdash/> MECHANICAL ENGINEERING</text> </titlePart> <titlePart> <text>LIGHTING</text> </titlePart> <titlePart> <text>HEATING</text> </titlePart> <titlePart> <text>WEAPONS</text> </titlePart> <titlePart> <text>BLASTING</text> </titlePart> MACHINES positive displacement rotary or oscillating piston liquid and elastic fluid or elastic fluid liquid only reciprocating piston or other liquid and elastic fluid or elastic fluid liquid only non-positive displacement liquid and elastic fluid or elastic fluid liquid only ENGINES positive displacement rotary or oscillating piston liquid and elastic fluid or elastic fluid liquid only reciprocating piston or other liquid and elastic fluid or elastic fluid liquid only non-positive displacement liquid and elastic fluid or elastic fluid liquid only PUMPS positive displacement rotary or oscillating piston reciprocating piston or other non-positive displacement <titlePart> <text>LIGHTING</text> </titlePart> <titlePart> <text>HEATING</text> </titlePart> <titlePart> <text>REFRIGERATION OR COOLING</text> </titlePart> <titlePart> <text>COMBINED HEATING AND REFRIGERATION SYSTEMS</text> </titlePart> <titlePart> <text>HEAT PUMP SYSTEMS</text> </titlePart> <titlePart> <text>MANUFACTURE OR STORAGE OF ICE</text> </titlePart> <titlePart> <text>LIQUEFACTION OR SOLIDIFICATION OF GASES</text> </titlePart> <titlePart> <text>LIQUEFACTION, SOLIDIFICATION, OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT</text> <entryReference>cryogenic pumps <sref ref="F04B0037080000"/></entryReference> <entryReference>gas storage vessels, gas-holders <sref ref="F17"/></entryReference> <entryReference>filling vessels with, or discharging from vessels, compressed, liquefied, or solidified gases <sref ref="F17C"/></entryReference> <entryReference>refrigeration machines, plants, or systems <sref ref="F25B"/></entryReference> </titlePart> <titlePart> <text>Processes or apparatus for liquefying or solidifying gases or gaseous mixtures</text> </titlePart> <titlePart> <text>requiring the use of refrigeration, e.g. of helium or hydrogen</text> </titlePart> <titlePart> <text>Processes or apparatus for separating the constituents of gaseous mixtures involving the use of liquefaction or solidification</text> </titlePart> <titlePart> <text>by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream</text> <entryReference><sref ref="F25J0003080000"/> takes precedence</entryReference> </titlePart> <titlePart> <text>for air</text> </titlePart> <titlePart> <text>by partial condensation</text> <entryReference><sref ref="F25J0003080000"/> takes precedence</entryReference> <entryReference>by rectification <sref ref="F25J0003020000"/></entryReference> </titlePart> <titlePart> <text>Separating gaseous impurities from gases or gaseous mixtures</text> <entryReference>cold traps <sref ref="B01D0008000000"/></entryReference> </titlePart> <titlePart> <text>Arrangements of cold-exchangers or cold-accumulators in separation or liquefaction plants</text> <entryReference>heat-exchangers <sref ref="F28C"/>, <sref ref="F28D"/>, <sref ref="F28F"/></entryReference> </titlePart>