Heebner & Sons, of Montgomery County, PA, was a manufacturer of agricultural machinery, particularly treadmill and lever-style horse powers, or horse-powered machinery. Heebner also made a table saw with an automatic blade guard and a portable farm steam engine in 4 sizes. As their 1885 catalog details, the engines were a lightweight design with no eccentric, connecting rod, or cross head.
A search on Google Books for "Heebner & Sons" found several family histories and the book Heebner & Sons: Pioneers of Farm Machinery in America, 1840-1926 by Francis Blase, 1984.