James Dyson's 5217 failed Prototypes before he invent first Cyclone vacuum Cleaner DC01
How I Built This - James Dyson first built a cardboard prototype of his game-changing vacuum cleaner -- a new bagless vacuum using "cyclone" technology. http://n.pr/2cm6jN6 | Facebook
Try, Try Again: Lessons From James Dyson's Invention of the Vacuum | Inc.com
James Dyson's 5217 failed Prototypes before he invent first Cyclone vacuum Cleaner DC01