Reel type rake or sweeper
作者： Loy D Rhoads
DOI:
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摘要:
lens.org 参考文章(4)
Harold J Cromwell, Power driven lawn sweeper ,(1962)
Hugo F Feuerlein, Rotary rake and sickle for attachment for lawn mower ,(1954)
John P Ferris, Spring tooth assembly for power driven lawn rakes ,(1959)
Edwin F Oblinger, Rake or sweeper ,(1966)