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* [http://khipukamayuq.fas.harvard.edu/ Quipu Database Project] | * [http://khipukamayuq.fas.harvard.edu/ Quipu Database Project] | ||
* [http://www.pawfal.org/dave/blog/2015/11/pixel-quipu/ Pixel Quipu] by Dave Griffith | * [http://www.pawfal.org/dave/blog/2015/11/pixel-quipu/ Pixel Quipu] by Dave Griffith | ||
=== Pulleys and Machines === | |||
* [[wikipedia:de:Flaschenzug Flaschenzug]](de) | |||
* [[wikipedia:en:Pulley Pulley]] | |||
* [http://www.lowtechmagazine.com/2010/03/history-of-human-powered-cranes.html History of Human-Powered Cranes] | |||
=== Signalling === | |||
* [[wikipedia:de:Schnurtelefon|Schnurtelefon]] (de) | |||
* [[wikipedia:en:Tin can telephone Tin can telephone]] | |||
[[Category:SS16]] | [[Category:SS16]] | ||