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| Timeline of steam power ： ウィキペディア英語版 |
Timeline of steam power
Steam power developed slowly over a period of several hundred years, progressing through expensive and fairly limited devices in the early 17th century, to useful pumps for mining in 1700, and then to Watt's improved steam engine designs in the late 18th century. It is these later designs, introduced just when the need for practical power was growing due to the Industrial Revolution, that truly made steam power commonplace.
==Development phases==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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