| 摘要 |
The indicator comprises a flat ruler with hour markings printed in rows and columns forming a table on the surface. The figures in pairs in the first two rows indicate the period within which the car arrived at the parking place, while the figure in the third row indicates the departure time. - An opaque cursor is arranged to slide along the ruler, with two windows to highlight the relevant figures in the three rows. The indicator may be attached to the sun visor of a car, so that it is visible through the car windscreen.
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