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The following 3 pages are in this category, out of 3 total.
19:
United States helicopters by decade of first flight
256:
Pages in category "1920s United States helicopters"
8:
182:
77:
15:
261:This list may not reflect recent changes
7:
186:Helicopters of the 1920s by country
81:United States aircraft of the 1920s
332:1920s United States civil aircraft
286:Curtiss-Bleecker SX-5-1 Helicopter
265:
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14:
1:
327:1920s United States aircraft
348:
322:United States helicopters
237:Soviet Union and Russia
91:Anti-submarine aircraft
298:De Bothezat helicopter
207: •
274:Berliner Helicopter
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32: •
28: •
203: •
103:Electronic warfare
317:1920s helicopters
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241:United Kingdom
205:Czechoslovakia
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119:Reconnaissance
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139:Agricultural
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107:Experimental
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311:Categories
171:Ultralight
159:Sailplane
155:Mailplane
127:Transport
88:Military:
147:Business
143:Airliner
233:Romania
217:Germany
197:Austria
175:Utility
167:Trainer
131:Utility
123:Trainer
111:Fighter
229:Poland
213:France
201:Canada
136:Civil:
115:Patrol
99:Bomber
95:Attack
225:Japan
221:Italy
209:China
163:Sport
151:Cargo
70:2020s
66:2010s
62:2000s
58:1990s
54:1980s
50:1970s
46:1960s
42:1950s
38:1940s
34:1930s
30:1920s
26:1910s
313::
263:.
293:D
281:C
269:B
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