ロールス・ロイス・ホールディングス
Manufacturers of heavy-duty lean-burn gas engines include MTU, Cummins, Caterpillar, MWM, GE Jenbacher, MAN Diesel &amp; Turbo, Wärtsilä, Mitsubishi Heavy Industries, Dresser-Rand Guascor, Waukesha Engine and Rolls-Royce Holdings.