Bibliografia

http://comohacer.eu/como-hacer-un-brazo-hidraulico-simple/
http://maquetasperuanas.blogspot.cl/2011_04_01_archive.html
https://www.youtube.com/watch?v=1k9poGl1f9M
https://www.youtube.com/watch?v=-38TMz4VU8c
https://www.youtube.com/watch?t=1&v=R82cqi4JLV8
https://www.youtube.com/watch?v=9EkTg85eFF8
http://manohidraulicafq.blogspot.cl/
http://tinxi-4-13.blogspot.cl/2010/05/justificacion.html