https://matematicahistoria.wordpress.com/2017/12/04/blaise-pascal-maquina-aritmetica/
https://codecamp.com.br/linha-tempo-computadores
https://sdioppolo.wordpress.com/2018/03/15/resumen-de-las-primeras-4-clases-unidades-i-a-iv/
https://www.khm.at/en/objectdb/detail/93360/
https://www.sfomuseum.org/exhibitions/mathematics-vintage-and-modern/gallery
https://dunapress.com/2019/03/24/maquina-diferencial-de-babbage/
https://www.alura.com.br/artigos/ada-lovelace-charles-babbage-eniac-breve-historia-computacao
https://www.computerhistory.org/revolution/calculators/1/47
https://www.youtube.com/watch?v=OWHIWXHHXiE
https://fap.if.usp.br/~crepaldi/archive/ECF_Final.pdf
https://revistapesquisa.fapesp.br/maquina-de-calcular/
https://www.atlasobscura.com/articles/objects-of-intrigue-curta-calculator
https://www.palladino.com.br/curta-i-old-calculator/
https://sketchfab.com/3d-models/curta-calculator-model-i-support-us-4fc9664b36f44f109f512e462d6a3c94
https://www.youtube.com/watch?v=8yQLdPLsvE0
https://www.palladino.com.br/rc-alle-bisiness-figuring-machine-old-calculator/
https://www.youtube.com/watch?v=nE5zcNn76Ss
https://www.youtube.com/watch?v=zJ3q4zjCKnM
https://www.douroleiloes.com.br/peca.asp?ID=7009673&ctd=18&tot=&tipo=
https://www.palladino.com.br/facit-ca1-13-old-calculator/
https://www.propagandashistoricas.com.br/2020/06/calculadora-manual-facit.html
Triumphator :
https://www.palladino.com.br/triumphator-c2-old-calculator/
https://www.jaapsch.net/mechcalc/triumphator.htm
https://americanhistory.si.edu/collections/nmah_692286
https://sketchfab.com/search?q=Brunsviga&type=models
Máquina Analítica:
https://mentalidadesmatematicas.org.br/maquina-analitica/
https://velip.com.br/charles-babbage-e-a-maquina-analitica-como-o-matematico-construiu-o-precursor-do-computador-moderno/
https://www.alura.com.br/artigos/ada-lovelace-charles-babbage-eniac-breve-historia-computacao
Máquina Diferencial:
https://kids.britannica.com/students/article/Difference-Engine/632101
https://www.britannica.com/technology/Analytical-Engine
Arithmometer:
https://history-computer.com/technology/arithmometer/
Anton Braun:
Morland:
http://www.computer-timeline.com/timeline/samuel-morland/
Máquina de calcular de Leibniz:
https://codecamp.com.br/linha-tempo-computadores
https://www.youtube.com/watch?v=aWDWiQHOCHw
https://www.youtube.com/watch?v=IQkkmQZKEEQ
https://webpages.ciencias.ulisboa.pt/~ommartins/seminario/a%20mao/leibniz_introducao.htm
Rapid Calc:
https://www.palladino.com.br/precisa-117-old-calculator/
https://www.youtube.com/watch?v=RwHhLBxTFiI
Presisa:
https://www.raroantiguidades.com.br/peca.asp?ID=16314234
https://www.palladino.com.br/museu-da-calculadora-mecanica-eletrica/
https://www.palladino.com.br/precisa-106-old-calculator/
Brunsviga:
http://www.mechrech.info/publikat/BruviMod1920.pdf
https://sketchfab.com/search?q=Brunsviga&type=models
https://www.johnwolff.id.au/calculators/Brunsviga/Brunsviga.htm