The following patents involve steamrollers, and are primarily under the name of the Buffalo Pitts subsidiary of The Buffalo Steamroller Company.  These machines were basically steam tractors that were modified to become steam rollers, at least at first. 

Later steamroller designs were steamrollers from the start.  Manufacturing took place in Buffalo, NY initially.  Later, a merger with Kelly-Springfield was proposed.  Unfortunately, a major stockholder of Buffalo Pitts stock wouldn't budge on voting "for" the merger. 

However, during this time steamroller manufacturing was moved to Springfield, Ohio.  Thus, Buffalo Steamroller Company and Kelly-Springfield steamrollers were all made under one roof.  Later, the merger was approved, thus forming the legendary Buffalo Springfield Company of Springfield, OH.