Low-profile umbrella base

作者: Alfred J. Bilotti

DOI:

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摘要: An umbrella base comprises a portion and neck portion. The has disc with an upturned annular collar communicating extending from the top surface of disc. have hollow interiors filled cement or sand, central bore provided therethrough for receiving further core coupled to neck, through holding shaft umbrella.

参考文章(7)
Raymond Bressani, Base for poles ,(1979)
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Raymond C. Dunaj, Collapsible stand for shade umbrellas ,(1992)
Herbert A. Plassmann, Lowell T. Wilson, Portable basketball set ,(1977)