National 3000 automatic bookkeeping calculating machine
1935-1945
L5000 Accounting Machine
1970-1979
Hewlett Packard HP 9810A programmable desktop calculator
1971
Olivetti Logos 270 electric printing calculator
circa 1970
The Preludin Calculator, for determining height-weight ratio, United Kingdom, 1955-1965
1955-1965
Seiko combined wristwatch and electronic calculator
1978
Addiator "Arithma" Calculator
1960-1965
Commodore 774D Calculator
1973-1975
Circular Colliery Ventilation Officer's calculator
Key-Set Mechanical Calculator
1920-1940
Addo adding machine model 16
1940-1959
Advance Mini Executive pocket electronic calculator
1972
Textile calculator made by Fowler Ltd
1910-1914
Commodore personal minicomputer (electronic calculator). Model 796M
circa 1979
Curta Type 2 Cylindrical Calculator
1959
Curta model 1 rotary calculator
1955-1965
Electro-mechanical calculator by Carl Walther
1935-1945
Multi-function preprogrammed Scientific notation calculators
1975
Radiac slide rule by Blundell Rules Limited
1960-1972
Isotope handling calculator
1950-1975
Prinztronic SC1500M electronic calculator
circa 1980
Hitachi KK562 electronic desktop calculator
Mechanical Calculator
1915-1925
Brother Procol 508AY
circa 1977
Sinclair "Cambridge" Calculator
1975
Integrator Unit from Hartree Differential Analyser
1936
Solar-powered electronic calculator
1990
Bell Punch "Anita" Electronic Calculator
1969-1971
Sharp Electronic Calculator
1965-1975
Sumlock 324G Scientist Calculator
1970-1975
Casablancas Textile Twist Calculator
1900-1930
Casio HL-807 Calculator
1980
Elsimate EL-8015
circa 1978
Mechanical Calculator
1885-1895
Mechanical Calculator
1925-1935
EL-112
circa 1976
Rotating Calculator
1922-1927
Elsimate Compet EL-8100 Calculator
1975-1980
Isotope calculator designed by AERE
1960
Brunsviga lever set calculator
1910
Mechanical Calculator
1900-1905
Mechanical Calculator
1915-1925
Rockwell 41OP electronic printing calculator
HP 55
1974
Mechanical Calculator
1916
Comptometer 993e electric calculator
1955-1965
Key-Set Mechanical Calculator
1950
Half adder from Type 555 Hollerith Electronic Calculator
1957
Rotch true-wind calculator, for use at sea
1903
HP 35 Electronic Calculator
1973