https://www.librosvivos.net/smtc/homeTC.asp?TemaClave=1122
https://www.xtec.es/~jrosell3/engranatges/
https://www.design-simulation.com/IP/spanish/simulations.php
https://www.brockeng.com/mechanism/
https://www2.ing.puc.cl/~icm2312/apuntes/index.html
https://www.librosvivos.net/smtc/homeTC.asp?TemaClave=1123
https://almez.pntic.mec.es/jgonza86/
https://en.wikipedia.org/wiki/Gear
https://en.wikipedia.org/wiki/Gear#Comparison_with_other_drive_mechanisms
https://www.xtec.cat/aulanet/seglexx/navegador/index.htm
https://www.theodoregray.com/PeriodicTable/
https://www.vaporllonch.net/vaporllonc/
https://www.emprendedorxxi.es/cat/homeCreacion.asp
https://www.injef.com/revista/empresas/tramites.htm
https://www.telefonica.net/web2/iestorreforta/tecnologia/2n_bat_te/enlaces.html
https://cst-www.nrl.navy.mil/lattice/
https://ca.wikipedia.org/wiki/M%C3%A0quina_simple
https://www.librosvivos.net/smtc/homeTC.asp?TemaClave=1123
https://www.edu365.cat/eso/muds/tecnologia/problemes/transmissio/transmissio.htm
https://www.xtec.cat/~jsolson7/eso/maquines/maquines.htm
https://www2.ub.edu/materials/AUTOMAT/TEMA1.htm
https://www.tecnun.es/Asignaturas/estcompmec/Diccionario/DiccMat.htm
https://www.elmhurst.edu/~chm/vchembook/index.html
https://www.eduteka.org/CreacionProyectos.php
https://www.todomicrostamp.com/enlaces.php
https://www.xtec.cat/~jlagares/mates2/index.htm
https://www.xtec.cat/~dcastell/webatxillerat/menu.html