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Water Lily Shaft : ウィキペディア英語版 | Water Lily Shaft
The Water Lily Shaft near Eureka, Utah was dug during 31 days in 1921 and won a "World Champion Shaft Sinking" competition. It was drilled by Walter Fitch Jr. Company using Waugh Clipper Drills, and set a record of "427.5 feet of vertical, three-compartment shaft" being dug in a 31-day period.〔 and (accompanying photo )〕 It was listed on the National Register of Historic Places in 1979 and is in the Tintic Mining District.〔 ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Water Lily Shaft」の詳細全文を読む
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