1950 - Technology - Helicopter

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1.
aircraft
2.
altitude
3.
aviation
4.
blade
5.
civilian
6.
cockpit
7.
control
8.
flight
9.
helicopter
10.
hover
11.
igorsikorsky
12.
maneuver
13.
military
14.
payload
15.
prototype
16.
range
17.
stability
18.
testflight
19.
transport
20.
verticaltakeoff