1811: Adding machine
Add Prop
912: Adding Machine, Comptometer
1128: Antique Pocket Fowler's Circular Calculator Slide Rule
645: Bone Slide Rule
651: Celluloid Circular Slide Rule
646: Celluloid Slide Rule
647: Celluloid Slide Rule
649: Celluloid Slide Rule
272: Fuller cylindrical slide rule
138: Logarithmic Rule
141: Otis King Calculator
652: Teaching Slide Rule
653: Teaching Slide Rule
1947: Victorian teaching abacus
1129: Vinatge Otis King Cylindrical Slide Rule Calculator
644: Wooden Slide Rule
650: Wooden Slide Rule
643: Wooden Slide Rule
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