Repeating shot archery bow with double sight
作者： Bert E Fredrickson
DOI:
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摘要:
lens.org 参考文章(5)
Erlo C Nelson, Automatic arrow holder ,(1952)
George S Ott, Arrow clamp for archery bows ,(1947)
Frank C Stieber, Sighting device for bows and arrows ,(1947)
Cameron Colin James, Archer's bow ,(1931)
Paul E Kvistad, Archer's bow. ,(1916)