Table tennis practice and game equipment

作者: J Cook

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摘要: Table tennis practice and game equipment comprising a quick knock-down, quick-reassembly ball receiving projecting unit, including tripod-mounted net, frame, projector, the whole adapted for free standing deployment at one end of table when in use, compact folding shipment or storage not use; projection elevation angle adjustment is by tipping units together.

参考文章(3)
Raymond J Lohr, Table tennis practice device ,(1959)
Ruhmschoettel Adolf, Kugelfangkasten fuer Schiessstaende ,(1952)