The Entrop was a Dutch automobile manufactured by a cycle company in 's Gravenmoer in 1909. The firm produced over 1500 bicycles, but only four cars.
The car was powered by an air-cooled engine mounted behind the single front wheel. It weighed, and used lever steering. There were two engines available: a single-cylinder 417 cc engine, and a two-cylinder 813 cc engine.[1]
. David Burgess-Wise . The New Illustrated Encyclopedia of Automobiles . 2000 . BookSales Inc . May 2000 Rev. Upd. . . 0-7858-1106-0.