Self supporting handtruck
作者： Douglas O. Deal
DOI:
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摘要:
lens.org 参考文章(5)
Sr. Frank S. Salvucci, Retractable hand truck having positive leg lock ,(1993)
Yasusuke Ishihara, Kazuya Maeda, Hand cart with fulcrum lever and vertically adjustable auxiliary wheels ,(1984)
Robert J Mistarz, Power driven vehicle arranged for hand propelling ,(1968)
Henry E. Scott, Self-propelled handtruck ,(1995)
Sidney S. Levine, Motorized golf trolley ,(1987)