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Calculate 3x5x2

If 3x4=20 and 5x4=32 then 3x5x2=?

Correct answers: 67

The first user who solved this task is Djordje Timotijevic.

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Submarine cable plow

In 1937, the first U.S. patent for a submarine cable plow was issued. It was designed to feed a cable at the same time that it would dig a trench in the ocean bed. The device could be used at depths up to a half mile. The first transatlantic cable of high-speed permalloy was buried on 14 Jun 1938. The inventors were Chester S. Lawton of Ridgewood, N.J. and Capt. Melville H. Bloomer of Halifax, Nova Scotia, Canada. They assigned the patent to the Western Union Telegraph Co. (No. 2,607,717).

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