1869-James Oliver patents a chilled-iron plow equipped with a smooth-surfaced moldboard that can slip through the hardened prairie soil without clogging. Other inventors will improve on his basic implement by covering the blade with an edge of tempered steel that can be removed for sharpening. By 1877 completely modern plows will be used.
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1922-In San Francisco, Samuel Dashiell Hammett resigns from Pinkerton’s National Detective Agency. Hammet has worked since 1915 as a professional detective, and his experiences will become the basis for his trendsetting detective novels, several of which are set in Western locales. Butte, Montana, is the Poisonville of Red Harvest, and The Dain Curse, The Maltese Falcon, and The Thin Man take place in San Francisco.
