IMPROVEMENTS RELATING TO TRAYS
作者： Derozarieux David
DOI:
关键词: Tray 、 Mechanical engineering 、 Computer science
摘要: A tray is provided for use on a user's lap, the having substantially flat working surface and with grip means its underside, comprising one or more downwardly projecting members which can be gripped by knees of user to hold steady lap.
lens.org 参考文章(7)
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