A special type of oil free, positive displacement reciprocating compressor, working without piston rings. The seal between piston and cylinder wall is produced by a series of labyrinths.
A deposit resulting from the oxidation and polymerization of fuels and lubricants when exposed to high temperatures. Similar to, but harder, than varnish.
Movement of cargo by water from one country through the port of another country, thence, using rail or truck, to an inland point in that country or to a third country. As example, a through movement of Asian cargo to Europe across North America.
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