| 摘要 |
A self-balancing tray for carrying glasses, cups, canapes consists of a disc supported by a frame to which a holder is releasably attached. A grip is fastened to the holder by a freely board-able thread or chain at a point coaxial with the center of the disc thereby causing the tray to assume a horizontal position irrespective of motions applied to the grip when the tray is carried.
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