Druten (population: 17,461) is a town in the eastern Netherlands, in the province of Gelderland. The municipality covers an area of 42.50 km².
The municipality of Druten also includes the following towns, villages and townships: Afferden[?], Deest[?], Horssen[?], Puiflijk[?].
... one finds 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 ...