| 摘要 |
A system of placement of adjacent roofing shingles on a roof is provided, whereby the horizontal spacing of adjacent shingles, the vertical placement of shingles, and the proper angular orientation of shingles is provided, due to a system of indicia on a visible upper surface of the shingles. A plurality of adjacent appropriately oriented shingles and appropriately placed shingles are provided, as is a roof having a plurality of shingles laid up thereon in courses.
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