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hydraulic coupling
hy·drau·lic cou·pling (plural hy·drau·lic cou·plings)


noun 
Definition:
 
piston arrangement with liquid: an arrangement in which two pistons of different sizes are connected by an enclosed fluid that can transmit pressure from one piston to the other
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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