Rotary-Lift Aircraft
Social technology I would say.
the answer is information and communication
energy and power
which area of technology best classifies an iPhone
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medical
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House appliances I guess
Mobility, mobile commerce, GPS, PDA, digital and video camera, e-reader, communication.
The telephone is an electrical/electronic communication technology.
An attack helicopter is best for attacking targets and a utility helicopter is best for carrying troops and supplies.
The Apache may be the best "attack" helicopter but the Navy MH 60 S is the most diverse platform and best utility helicopter in the world.