138: Logarithmic Rule
Add Prop
141: Otis King Calculator
272: Fuller cylindrical slide rule
643: Wooden Slide Rule
644: Wooden Slide Rule
645: Bone Slide Rule
646: Celluloid Slide Rule
647: Celluloid Slide Rule
649: Celluloid Slide Rule
650: Wooden Slide Rule
651: Celluloid Circular Slide Rule
652: Teaching Slide Rule
653: Teaching Slide Rule
912: Adding Machine, Comptometer
1128: Antique Pocket Fowler's Circular Calculator Slide Rule
1129: Vinatge Otis King Cylindrical Slide Rule Calculator
1811: Adding machine
1947: Victorian teaching abacus
© 2025 Film Medical Services Ltd
