We organize Study Tours to show off the best cycling infrastructure in the world.
Unusual videos of bikes in the Netherlands
1939: Bike with "new" pedal mechanism. A treadle system I think.
1940: Scooter / Kickbike with eccentric rear wheel which once started can be propelled by moving your weight instead of by putting a foot to the floor.
1942: Bike propelled by arms and legs together
Another more recent, but unusually propelled bike, was featured on my blog