How long did it take James dyson to develop his vacuum cleaner?

Answer from the united kingdom

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How did James dyson create the vacuum cleaner?

Smoked salmon will keep in the fridge for two to three weeks as long as it has not been opened

In what year did James Dyson build his first prototype vacuum cleaner?

What inspired James dyson to realise that a new vacuum cleaner might be a good idea?

Frigidaire is a U.S. company that started in dayton Ihio. I don't know if it has move over seas but that is where it started.

How long did it take to develop the roomba IRobot vacuum cleaner?