Mechanical Calculator Brunsviga model 13Z
1945-1955
Mechanical Calculator
1925-1935
Mechanical calculator
1890-1910
Electronic Calculator
1973
Mechanical Calculator
1950
Key-Driven Calculator
1940-1960
Key-Set Mechanical Calculator
1965-1975
Wangs Lab Model 370 Calculator
1973
Mechanical Calculator
1960
Barrel Calculating Machine
1890-1900
Wang Labs calculator and accessories
circa 1973