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Find number abc

If 68b10 - c6a78 = 4c1ac find number abc. Multiple solutions may exist.

Correct answers: 27

The first user who solved this task is Nasrin 24 T.

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Tense disagreement

Have you heard about the kid who was going to argued with his dad?
There was a tense disagreement.

Original joke by @nogueydude

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Electric motor

In 1904, the first direct current, interpole, electric motor to be patented in the U.S. was issued to Mathias Pfatischer of Phildadelphia, Pennsylvania under the title "Variable Speed Motor" (No.775,310). His improvement was to "effect commutation without sparking, with a variable load as well as at variable speed and which is capable of rotation in either direction." The new design added auxiliary-field pole-pieces which were small as compared to the main pole-pieces.«

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