Petters Limited (known as JB Petter & Sons of Yeovil until 1910), were a maker of stationary petrol and diesel engines from 1896 onwards. In 1915 Petter founded Westland Aircraft Works (renamed "Westland Aircraft" in 1935). In 1986 Petters Limited merged with one-time rival R A Lister and Company to form Lister Petter.