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Jacob's ladder (knife) : ウィキペディア英語版 | Jacob's ladder (knife)
The "Jacob's ladder" is a type of pocketknife consisting of two handle segments joined by a pivot, with a blade connected by a second pivot to the end of one handle segment.〔 The design presumably takes its name from the multi-jointed wooden toy also known as a Jacob's ladder, which is itself named after the ladder to heaven witnessed by the biblical patriarch Jacob (Genesis 28:12). ==Design== It is conceptually similar to the balisong ("butterfly knife") in that it has no mechanical lock or spring pressure, but is kept in the open position during use by the leverage imparted by the user's hand.
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「Jacob's ladder (knife)」の詳細全文を読む
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