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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in use in limited numbers into the early 1990s, but with the exception of museum pieces, they have all now been superseded by electronic calculators and computers.Manufactured without interruption from 1887 to the mid-1970s it was constantly improved; first it was made faster and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 comptometers.htm.
- Comptometer wikiPageExternalLink ComptHome.html.
- Comptometer wikiPageExternalLink indexEnglish.html.
- Comptometer wikiPageExternalLink Comptometer-instructions.html.
- Comptometer wikiPageExternalLink Comptometer.
- Comptometer wikiPageExternalLink watch?v=SbJpufimfdM.
- Comptometer wikiPageID "408007".
- Comptometer wikiPageRevisionID "600866810".
- Comptometer hasPhotoCollection Comptometer.
- 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 Ability105616246.
- Comptometer type Abstraction100002137.
- Comptometer type AmericanInventions.
- Comptometer type Cognition100023271.
- Comptometer type Creativity105624700.
- Comptometer type Invention105633385.
- Comptometer type InventionsInTheCollectionOfTheSmithsonianInstitution.
- Comptometer type PsychologicalFeature100023100.
- 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 label "Comptometer".
- Comptometer label "Comptometer".
- Comptometer label "Comptomètre".
- Comptometer label "Comptómetro".
- Comptometer sameAs Comptometer.
- Comptometer sameAs Comptómetro.
- Comptometer sameAs Comptomètre.
- Comptometer sameAs Comptometer.
- Comptometer sameAs m.024ppt.
- Comptometer sameAs Q572421.
- Comptometer sameAs Q572421.
- Comptometer sameAs Comptometer.
- Comptometer wasDerivedFrom Comptometer?oldid=600866810.
- Comptometer depiction Comptometer_model_ST_Super_Totalizer.png.
- Comptometer isPrimaryTopicOf Comptometer.