Rechargeable flashlight-directly accessible batteries
作者： Hultquist J Albert
DOI:
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摘要:
lens.org 参考文章(3)
Springer Hans, Toothbrush storage case and battery charger ,(1962)
Gerhard Schmidt, Gerhard Volkerling, Albert Eckstein, Combination flashlight and battery recharging unit ,(1958)
William C Moore, Rechargeable battery handle ,(1958)