Rahmenbau

http://www.framebuilding.com/

http://www.hwk-rhein-main.de/ 

http://www.norwid.de/

http://www.legorcicli.it/?cat=3

http://www.vogel-rahmenbau.de/index.htm

http://www.vogel-rahmenbau.de/index.htm

http://www.reset-racing.de/

http://www.bikelugs.com/about/

http://www.cycle-frames.com/bicycle-frame-tubing/

http://www.richardsachs.com/site/

- http://www.richardsachs.com/site/how-frames-are-made/

- YiPsan's videos on Vimeo

http://www.bringheli.com/index.html

http://www.paragonmachineworks.com/