| 摘要 |
A manufacturing process includes mitering each end of a central member and mitering a single end of each of two end members formed, along with the central member, from a single piece of extruded stock having an inner surface including upper and lower attachment slots and an outer surface including upper and lower trim receiving slots. An "L"-shaped corner bracket is placed to extend within the upper and lower attachment slots at each end of the central member and between such slots at the mitered ends of the end members. A heat forming process is then applied to form corners of a decorative trim strip which is then placed to extend between the upper and lower trim receiving slots of the end members and the central members.
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