Find number abcIf 464bc - 250a7 = 2bacb find number abc. Multiple solutions may exist.
Correct answers: 11
The first user who solved this task is Nasrin 24 T.
Edison patentsIn 1890, Thomas A. Edison was granted U.S. patent No. 437422 for telegraphy, Nos. 437423,-4,-6 for a phonograph; No. 437425 for a phonograph-recorder; No. 437427 for a "Method of Making Phonograph Blanks"; No. 437428 for a "Propelling Device for Electrical Cars"; and No. 437429 for a phonogram blank.[Image: detail from Patent No. 437422.]