Boeing Company (CH-47 Chinook)
Bell (UH- 1)
Sikorsky (UH-60 Black Hawk)
Hughes (AH-64 Apache)
France
Air France Aerospace Corporation (Dolphin)
Britain, England
Westland (Bobcat)
Italy
Agusta (A- 129)
South Africa
Atlas (tea falcon)
Europe
Eurocopter (EH- 10 1)
Russia
Miri (m -8, m-26)
Kamov (Ka -27)
Hafei (Zhi 9)
Changhe (Zhi 8)
PS: Before Eurocopter was founded, many French companies had their own helicopter manufacturers, which were integrated after Eurocopter was founded. EH- 10 1 is a project of Eurocopter. At present, the development of European helicopters is mainly based on multinational cooperation, and its composition is more complicated. It's hard to say which one.
PS-2: The design bureau and manufacturer of Soviet/Russian helicopters are separate. Miri and kamov are their design bureaus, not manufacturers.
PS-3: Hughes Helicopter was acquired by McDonnell Douglas in 1984 and became McDonnell Douglas Helicopter Company. 1997, McDonnell Douglas merged with Boeing.