Category:Precursors to balance boards
From Wikimedia Commons, the free media repository
This category has only the following subcategory.
- ► Wobble board precursors (6 F)
Media in category "Precursors to balance boards"
The following 2 files are in this category, out of 2 total.
- Child's platform on springs by Campbell in 1922.png 1,810 × 2,782; 116 KB
- Pedal bike uphill simulator by Bechman in 1941.png 1,737 × 2,699; 143 KB