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サマリー
あらすじ・解説
Idaho lumberjacks sent logs down the rivers, but one log could cause huge jams. Dynamite worked, but was dangerous. Ephraim Shay invented a small railroad engine that effectively pulled log laden rail cars. John Dolbeer invented the steam driven "donkey engine" for extracting logs. Simon Benson invented the first successful method for floating log rafts to San Diego. Learn more about your ad choices. Visit podcastchoices.com/adchoices