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controlling interest
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control surface
con·trol sur·face (plural con·trol sur·fac·es)


noun 
Definition:
 
movable external surface that controls aircraft: a movable surface that controls the direction of an aircraft, rocket, or missile, e.g. a rudder or elevator
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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