Word: hacksawing
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Dates: during 1930-1930
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...especially tough. Investigation with a file led to the estimate that this nickel-iron alloy compares in hardness with the hardest steel used on railroads. An idea of the toughness may be obtained from the fact that it took fully two hours of sawing and more than a dozen hacksaw blades to saw off a piece with a surface of only two inches...