Doetinchem (population: 48,700) is a town in the eastern Netherlands, in the province of Gelderland. The municipality covers an area of 52.74 km² (of which 1.50 km² water).
The municipality of Doetinchem also includes the following towns, villages and townships: Dichteren[?], Gaanderen[?], IJzevoorde, Langerak[?], Wijnbergen[?].
... the "rolling" point, but the gyro will also be accelerated to a smaller extent by the slipping friction.
The device is covered by US patents 3,726,146 (1973) and ...