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man lock

an air lock serving as a decompression chamber for workers. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for man lock

man lock

(civil engineering) an airlock that allows workmen to pass in and out of spaces with differing air pressures, esp one providing access to and from a tunnel, shaft, or caisson in which the air is compressed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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