Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:Defunct_helicopter_manufacturers_of_the_United_States> . }
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- Bell_Aircraft subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Bendix_Helicopters subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Bensen_Aircraft subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Continental_Copters subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Curtiss-Wright subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Curtiss_Aeroplane_and_Motor_Company subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Fleet_Aircraft subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Gyrodyne_Company_of_America subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Higgins_Aircraft subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Higgins_Industries subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Hughes_Aircraft_Company subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Hughes_Helicopters subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Jovair subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Lockheed_Corporation subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- McCulloch_Aircraft_Corporation subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- McDonnell_Aircraft subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- McDonnell_Douglas subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Piasecki_Helicopter subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Pitcairn_Aircraft_Company subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Platt-LePage_Aircraft_Company subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Republic_Aviation subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- Revolution_Helicopter_Corporation subject Category:Defunct_helicopter_manufacturers_of_the_United_States.
- United_Helicopters subject Category:Defunct_helicopter_manufacturers_of_the_United_States.