| 摘要 |
Improved prefabricated frame for windows or doors in urban panels, which consists of four framing sections having a closed cross-section, joined in pairs at right angles, two opposite sections (2a-2b) being identical and the two other opposite sections (1-3) being different from each other, each section having a rim which defines a front stop (22) for the window or door to be mounted, and one of these sections having shaped parts (11, 21, 31) for mounting into the corresponding urban panel. <IMAGE>
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