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Dyson reveals home robot prototypes that can carry out domestic chores
Praising Failure: James Dyson Talks Vacuum's 5,127 Prototypes
Dyson | Only a Dyson works like a Dyson: the engineering behind Dyson vacuums
Dyson Service Center - It took 5 years and 5,127 prototypes for James Dyson to invent the world's first bagless vacuum cleaner. 43 years later, Dyson continues to innovate with new technologies.
How we made the Dyson vacuum cleaner | Design | The Guardian