Covering for recreational areas

作者: Raymond Robinson Kelcey

DOI:

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摘要: A cover for a recreation area including horizontally disposed structure suspended by an upright support member; which being moveable between position preventing access to the and clear of permit thereto. The may be mounted raised or lowered while remaining horizontal pivotally vertical position. Desirably can also move in plane from above beside area.

参考文章(7)
Jacob A Vierling, Polygonal swimming pool cover ,(1960)
Jack T Prudek, Swimming pool cover and shade ,(1958)
Leland T Mcgee, Covered swimming pool ,(1953)
J Myles, Swimming pool cover ,(1972)