Word: overhauling
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Dates: during 1920-1929
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...half times round the world at the equator). Measured against the average record of 6,500 miles per annum of a high grade automobile, it represents nine years' unbroken service at 100 miles per hour. During the war engines scarcely ran 100 hours without overhaul. This tremendous improvement means greatly increased dependability and lessened cost of operation for every type of airplane...