GE Transportation (US)
Caterpillar (US)
Cummins Inc. (US)
Rolls-Royce Power Systems (Germany)
MAN Energy Solutions (Germany)
W?rtsil? (Finland)
Mitsubishi Heavy Industries (MHI) Group (Japan)
Brunswick (US)
Volvo Penta (Sweden)
YANMAR (Japan)
Scania AB (Sweden)
Deere & Company (US)
Deutz AG (Germany)
Hyundai Heavy Industries Co. Ltd. (South Korea)
STX Engine (Hong Kong).