Robotic arm
Theory
- http://www.societyofrobots.com/robot_arm_tutorial.shtml
- http://www.scholarpedia.org/article/Light-weight_robots
- http://www.xrobots.co.uk/
connector
Rotating Electrical Connector
- http://www.swivelelectricalconnector.com/rotating_electrical_connectors/swivel_electrical_connector_best.php
- http://aksr.co.kr/tech/images/faq04.jpg
"Quick-locking circular Ethernet connector"
Mechanic
- "swivel" http://www.bestmarineimports.com/Connectors.html
- planetary gear : http://img.directindustry.fr/images_di/photo-g/moto-reducteur-a-vis-sans-fin-avec-reducteur-planetaire-275557.jpg
