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Ingenious Invention – Stair climbing cart!
Ingenious Invention - Stair climbing cart!
March 21, 2016
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This Day in Patent History – On March 22, 1960, Schawlow and Townes were issued a patent for the laser
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This Day in Patent History – March 23 is celebrated as Family Day in South Africa, and in some regions of Canada, US, Vietnam, Australia and Thailand
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