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Find number abc

If 73ca5 + ac317 = 1b3b6b find number abc. Multiple solutions may exist.

Correct answers: 5

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U.S. international airmail

In 1919, the first U.S. international airmail service began. Mail was flown 74 miles from Seattle, Washington to Victoria, B.C., Canada. The carrier was pilot Edward Hubbard flying a Boeing type-C open cockpit biplane with pontoons. Edward Boeing accompanied as a passenger on the first interantional airmail flight.«*

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