In Exercises use estimation techniques to solve the given problem.
Patents In 2007, the U. S., Patent and Trademark Office issued patent number 7,000,000. If the first patent was issued in 1836, and patent numbers 1 million, 2 million, 3 million, 4 million, 5 million, and 6 million were issued in 1911, 1936, 1961, 1976,1991, and 2000, respectively, approximate the year when patent number 9 million will be issued.
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