Row crop seed planter
作者： George E Walters
DOI:
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摘要:
lens.org 参考文章(6)
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Edward C Roepke, Particle selecting and dispensing device ,(1959)
Eddie P Mattson, Seed separating and feeding mechanism ,(1954)
Jensen Otto, Radsåmaskine med mekanisme til enkeltvis udsåning af frøene. ,(1949)