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How many patents are there for the wheel?

Or, how many times has the wheel been reinvented?

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The vulcanized rubber tires have gone through 7 patents since their introduction in 1844. The first tires were introduced by Charles Goodyear and in 1888, john Dunlop invented air-filled tires. Phillip Strauss invented a tire that had a combination of air filled inner tube in 1911. Get more details from http://inventors.about.com/library/inventors/bltires.htm.

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Which type of wheel?

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Exactly. From 3500 BC until now, how many incarnations of the wheel has there been??
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What I meant was steering wheel, no hub wheel, Ferris wheel, etc........
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The wheel we use for transportation
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There have been tons of patents. Just google "auto mobile wheel patent"
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