Find number abc
If b2b71 - 12b5a = a001c find number abc. Multiple solutions may exist.Correct answers: 32
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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). |