| 摘要 |
A window or door structure comprising a sub-frame having at least one rectangular window or door opening the sub- frame being formed of members 5, 6 of identical cross-sectional shape and size having opposed side faces formed longitudinally with at least one re-entrant formation to receive an intermediate member 37 which may be engaged as a clip- fit in either of at least two ways with the or each formation the inner part of the member 37 carrying at least one longitudinal formation to receive a beading extrusion 4a as a clip fit. <IMAGE> |
