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Find number abc

If bb5ac - cbbb9 = c9a04 find number abc. Multiple solutions may exist.

Correct answers: 21

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

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Edison patent

In 1873, Thomas A. Edison was issued a U.S. patent for an "Improvement to Circuits for Chemical Telegraphs" (No. 135,531). It concerned a method to reduce the problem of marks running together on the chemical paper from the electric action of one pulsation from the telegraph wire not clearing before the next followed. Edison utilized electromagnets in local or branch circuits to sharpen the pulses.

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