Who Makes The Engine For John Deere Lawn Tractors?

Who Makes The Engine For John Deere Lawn Tractors? The engines used in their machinery are mainly made by themselves but for certain machinery which requires less horsepower like 100Hp and below, John Deere uses engines from Kawasaki, Yanmar, and Briggs & Stratton. Does John Deere make their own lawn mowers? Latest update 3/4/2020: In