A specially designed abacus that keeps beads in position once they have been set.
The Blind Abacus Mathematic Concepts Blind Abacus Learning Tool For Early DY9
Cranmer Abacus American Printing House
Soroban Cranmer Abacus by Magno de Alcantara Leite Alcantara Leite, Download free STL model
The Blind Abacus, Math Concepts Blind Abacus Mathematic For Early Education
Cranmer Abacus Counting Method 9/10 exchange
National Museum of American History
60 second overview of the Cranmer abacus.
The Lovely Cranmer Abacus, By Ms. Kathy's Kids Visual Impairments Resource, LLC
Cranmer Abacus Counting Method Division: four digit by two digit
TMISHION The Blind Abacus, Professional Mathematic Concepts Blind Abacus Learning Tool Braille Slate Braille Writing Slate Plastic Kit Number Board Braille Stickers Raised Tactile Dots for Blind : Toys & Games
Reizen Abacus for The Blind : Health & Household
