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What is the missing number i...

What is the missing number in the pattern above?

Correct answers: 290

The first user who solved this task is Rutu Raj.

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Microwave patent

In 1950, the original microwave oven patent was issued to its inventor Percy LeBaron Spencer under the title "Method of Treating Foodstuffs." (U.S. No. 2,495,429.)

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