| 摘要 |
A curved apparatus which remains stable when placed on a substantially flat surface is shown which has a base portion with an arcuately shaped back surface capable of resting on the substantially flat surface, a hinge rotatably fixed to the base portion, and a cover secured to the hinge and rotatable therewith, to prevent rocking of the base portion when the base portion's front surface is touched while the base portion is resting on the substantially flat surface. Other devices and systems are also disclosed.
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