On this day in 2018, US Patent No. 10,000,000 was granted.
From No. 1 in 1836, each next million took:
75y, 24y, 26y, 15y, 14y, 9y, 6y, 5.5y, 3.6y, 3.2y, 2.9y, and 3.1y.
First million took 75 years.
Now, about 1 million every 3 years.
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