Know it's not included in the poll, but I would have to go with Ruston & Hornsby. There is just such an endless variety of them! The Ruston Bucyrus cable excavators used them exclusively,and every model and variant had a different R&H engine in it. Power stations and industries had a huge variety, from horizontals large and small, to verticals in every size and configuration.
Who else built a seven cylinder inline vertical?
Still have my R&H 3VQBN and its 6PS air starter from a 1930's cable shovel,and I caretake a 3VROHN in a small RB dragline. Who knows what will turn up next? Combustor.
