Calculator collection - key-driven
Key-driven calculators
Click on each model for additional information
Comptometer - Model H
Approx. 1921
SN: 209426
Bell Punch - Sumlock
1940 ->
SN: 909/C/42472
Contex - Model A
?
SN: 42084
Comptometer - Model J
Approx. 1940
SN: 345199
Bell Punch Plus
1939 ->
SN: 509/C/84599/Q
Comptometer - Model F
Approx. 1918
SN: 131626