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Can you find the numbers ABC...

Can you find the numbers ABCD so that the following calculation is proved? (ABCD x 4 = DCBA)

Correct answers: 50

The first user who solved this task is aysan saidie.

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Missing Puzzle Piece

My friend is losing his mind over missing a piece of his 5000 piece puzzle.
If he thinks thats bad, I'm missing 4999 pieces.

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Edison patent

In 1876, Thomas A. Edison was issued three patents for "Duplex Telegraphs" (U.S. No. 178,221; -3). These were for "an Improvement in Duplex Telegraphs" which enable a transmitted signal be sent on the same wire that could be receiving a signal. In patent 178,222, Edison describes "A balanced battery is used for transmitting when the balance is disturbed. An electromagnet is used, through which both the received and transmitted pulsations pass, and the connections are made so that the action of the current sent is balanced, while that coming from the distant station is operative, to work a balanced relay and local circuit or sounder."

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