Jeremiah Sweinhart and Successors. The evolution of the business located here mirrors America's changing transportation scene. In the factory begun by Mr. Sweinhart in 1872, horse-drawn carriages, farm and delivery vehicles, and sleighs were built. After 1914, bus and truck bodies, and other commercial and military vehicles, were made here. Production ceased, 1990, but the original 1872 shop became part of the Boyertown Museum of Historic Vehicles.