Wheelchair
device · 1655 · Early modern era
A chair on wheels; the self-propelled one — Farffler.
What it is made of
- Wheel — has part. Wheels.
- Spoke — has part. Spoked wheels.
- Ball bearing — has part. Bearings.
- Hub motor — has part. Powered wheelchairs.
Principles and materials it uses
- Wood — is made of. Stephan Farffler’s chair was wooden.
History: what it evolved from and what it influenced
- Crutches — evolved from. Mobility aids.