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