| 摘要 |
An inventive top profile design of friction ridges on a top surface of grate bars in a swimming pool deck. The profiles exhibit a multiple of crosses with each cross having four quadrants. Within each of the quadrants there is located a first right angled profile which is open in an outward direction. Within each of the first right angled profile there is located a second smaller right angled profile which is also open in an outward direction. The above mentioned profiles repeat themselves along the entire length of the grate bars.
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