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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. 2017.
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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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