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Find number abc

If c9cac - 4c937 = 13c6b find number abc. Multiple solutions may exist.

Correct answers: 2

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Edison patent

In 1930, Thomas A. Edison was issued a patent for the "Production of Molded Articles" (No. 1,744,534) and a method of "Mounting for Diaphragms of Sound Boxes" (No. 1,744,533).

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