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- Comptometer abstract "The comptometer was the first commercially successful key-driven mechanical calculator, patented in the USA by Dorr E. Felt in 1887.A key-driven calculator is extremely fast because each key adds or subtracts its value to the accumulator as soon as it is pressed and a skilled operator can enter all of the digits of a number simultaneously, using as many fingers as required, making them sometimes faster to use than electronic calculators. Consequently, in specialized applications, comptometers remained in use in limited numbers into the early 1990s, but with the exception of museum pieces, they have all now been superseded by electronic calculators and computers.Manufactured without interruption from 1887 to the mid-1970s it was constantly improved; first it was made faster and more reliable, then a line of electro-mechanical models was added in the 1930s, but especially it was the first mechanical calculator to receive an all-electronic calculator engine in 1961, with the ANITA Mark VII model released by Sumlock Comptometer, therefore creating the link in between the mechanical and the electronic calculator industries.Although the comptometer was primarily an adding machine, it could also do subtractions, multiplication and division. Its keyboard consisted of eight or more columns of nine keys each. Special comptometers with varying key arrays were produced for a variety of special purposes, including calculating currency exchanges, times and Imperial weights. The name comptometer was formerly in wide use as a generic name for this class of calculating machine.".
- Comptometer thumbnail Comptometer_model_ST_Super_Totalizer.png?width=300.
- Comptometer wikiPageExternalLink 2346-9595_22-160275-9.html.
- Comptometer wikiPageExternalLink enlarge.cfm?ID=349&ShowEnlargement=1.
- Comptometer wikiPageExternalLink ComptHome.html.
- Comptometer wikiPageExternalLink indexEnglish.html.
- Comptometer wikiPageExternalLink Comptometer-instructions.html.
- Comptometer wikiPageExternalLink comptometers.htm.
- Comptometer wikiPageExternalLink Comptometer.
- Comptometer wikiPageExternalLink watch?v=SbJpufimfdM.
- Comptometer wikiPageID "408007".
- Comptometer wikiPageLength "17604".
- Comptometer wikiPageOutDegree "47".
- Comptometer wikiPageRevisionID "668866858".
- Comptometer wikiPageWikiLink Adding_machine.
- Comptometer wikiPageWikiLink Arithmometer.
- Comptometer wikiPageWikiLink Bell_Punch.
- Comptometer wikiPageWikiLink Blaise_Pascal.
- Comptometer wikiPageWikiLink Calculator.
- Comptometer wikiPageWikiLink Category:American_inventions.
- Comptometer wikiPageWikiLink Category:Inventions_in_the_collection_of_the_Smithsonian_Institution.
- Comptometer wikiPageWikiLink Category:Mechanical_calculator_companies.
- Comptometer wikiPageWikiLink Category:Mechanical_calculators.
- Comptometer wikiPageWikiLink Chicago.
- Comptometer wikiPageWikiLink Computer.
- Comptometer wikiPageWikiLink Continental_Europe.
- Comptometer wikiPageWikiLink Currency_exchanges.
- Comptometer wikiPageWikiLink Difference_engine.
- Comptometer wikiPageWikiLink Dorr_E._Felt.
- Comptometer wikiPageWikiLink Dorr_Felt.
- Comptometer wikiPageWikiLink Electronic_calculator.
- Comptometer wikiPageWikiLink Exchange_rate.
- Comptometer wikiPageWikiLink Generic_trademark.
- Comptometer wikiPageWikiLink Genericized_trademark.
- Comptometer wikiPageWikiLink Imperial_units.
- Comptometer wikiPageWikiLink Imperial_weight.
- Comptometer wikiPageWikiLink Mechanical_calculator.
- Comptometer wikiPageWikiLink Method_of_complements.
- Comptometer wikiPageWikiLink New_Years_Day.
- Comptometer wikiPageWikiLink Pascaline.
- Comptometer wikiPageWikiLink Pascals_calculator.
- Comptometer wikiPageWikiLink Rockwell_International.
- Comptometer wikiPageWikiLink Sharp_Corporation.
- Comptometer wikiPageWikiLink Smithsonian_Institution.
- Comptometer wikiPageWikiLink Sumlock_ANITA_calculator.
- Comptometer wikiPageWikiLink USA.
- Comptometer wikiPageWikiLink United_States.
- Comptometer wikiPageWikiLink Victor_Technology.
- Comptometer wikiPageWikiLink Washington,_D.C..
- Comptometer wikiPageWikiLink World_War_I.
- Comptometer wikiPageWikiLink World_War_II.
- Comptometer wikiPageWikiLink Z1_(computer).
- Comptometer wikiPageWikiLink File:Animation_of_Comptometer_Pins.gif.
- Comptometer wikiPageWikiLink File:AnitaMk8-01.jpg.
- Comptometer wikiPageWikiLink File:AnitaPrototype1.jpg.
- Comptometer wikiPageWikiLink File:Comptometer.jpg.
- Comptometer wikiPageWikiLink File:Comptometer_Model_A.jpg.
- Comptometer wikiPageWikiLink File:Comptometer_Model_WM.jpg.
- Comptometer wikiPageWikiLink File:Comptometer_model_E.png.
- Comptometer wikiPageWikiLink File:Comptometer_model_ST_Super_Totalizer.png.
- Comptometer wikiPageWikiLink File:DesktopMechanicalCalculators_inProduction_intheXIXCentury.svg.
- Comptometer wikiPageWikiLink File:EarlyComptometerKeyboard.png.
- Comptometer wikiPageWikiLink File:EarlyComptometerMachine.png.
- Comptometer wikiPageWikiLink File:Macaronibox.jpg.
- Comptometer wikiPageWikiLink File:Mechanical-Calculator.png.
- Comptometer wikiPageWikiLinkText "Comptometer".
- Comptometer wikiPageWikiLinkText "Comptometer#Comptometer and comptograph".
- Comptometer wikiPageWikiLinkText "Comptometer#Sumlock".
- Comptometer wikiPageWikiLinkText "Comptometrist".
- Comptometer wikiPageWikiLinkText "comptometer".
- Comptometer wikiPageWikiLinkText "comptometrist".
- Comptometer wikiPageWikiLinkText "comptometry".
- Comptometer hasPhotoCollection Comptometer.
- Comptometer wikiPageUsesTemplate Template:Reflist.
- Comptometer subject Category:American_inventions.
- Comptometer subject Category:Inventions_in_the_collection_of_the_Smithsonian_Institution.
- Comptometer subject Category:Mechanical_calculator_companies.
- Comptometer subject Category:Mechanical_calculators.
- Comptometer type Company.
- Comptometer type Artifact.
- Comptometer type Collection.
- Comptometer type Company.
- Comptometer type Machine.
- Comptometer type Technology.
- Comptometer type Thing.
- Comptometer comment "The comptometer was the first commercially successful key-driven mechanical calculator, patented in the USA by Dorr E. Felt in 1887.A key-driven calculator is extremely fast because each key adds or subtracts its value to the accumulator as soon as it is pressed and a skilled operator can enter all of the digits of a number simultaneously, using as many fingers as required, making them sometimes faster to use than electronic calculators.".
- Comptometer label "Comptometer".
- Comptometer sameAs Comptòmetre.
- Comptometer sameAs Comptometer.
- Comptometer sameAs Comptómetro.
- Comptometer sameAs Comptomètre.
- Comptometer sameAs קומפטומטר.
- Comptometer sameAs Comptometer.
- Comptometer sameAs m.024ppt.
- Comptometer sameAs Q572421.
- Comptometer sameAs Q572421.
- Comptometer wasDerivedFrom Comptometer?oldid=668866858.
- Comptometer depiction Comptometer_model_ST_Super_Totalizer.png.
- Comptometer isPrimaryTopicOf Comptometer.