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Electronic Calculators—Handheld
BECOME A HUMAN CALCULATOR COURSE - KIDS EDITION - NOT USED - Scott
The Mind-Bending Math Behind Spot It!, the Beloved Family Card
Unopened package Includes instructions, Calculator and Stylus are both metal
Vintage 1960's Magic Brain Pocket Calculator W/Stylus, Made in Hong Kong
George Widener: Magic Circles
Index Smithsonian Institution
References, Page 4
Magic-Brain Calculator Smithsonian Institution
JF Ptak Science Books: Future, History of the
Unopened package Includes instructions, Calculator and Stylus are both metal
Vintage 1960's Magic Brain Pocket Calculator W/Stylus, Made in
Magic Brain: Last Gasp of the Mechanical Calculator