Steven F. Udvar-Hazy Center: South hangar panorama, including stunt planes (DHC-1A Chipmunk, Monocoupe 110 Special, etc) hanging over the Concorde, among others (Photo credit: Chris Devers)
English: Design pattern servant, one way of implementation: User requests operations from serviced instances, which then asks servant to do it for them. (Photo credit: Wikipedia)
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