Find number abc
If 72b27 - ac9b5 = aabc2 find number abc. Multiple solutions may exist.Correct answers: 35
The first user who solved this task is Nílton Corrêa De Sousa.
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Gas MaskIn 1849, the forerunner of modern gas masks is patented by Lewis Phectic Haslett of Louisville, Ky. His "inhaler or lung protector" design used woolen fabric (or other porous material) to filter dust and other material from the air (U.S. No. 6,529). |