Following the sale of Union Electric Signal to US&S, Robinson turned his attention to other fields, particularly mechanical inventions. His other significant inventions included: • the Robinson radial car
truck • the first
coaster brake used on
bicycles • roller bearing
skates, and • a repeating
telephone. William Robinson was the author of
History of Automatic Electric and Electrically Controlled Fluid Pressure Signal Systems for Railroads (1906). ==Professional recognition==