(57) The side jambs (11C, 11D), the sill (11B) and the frame head (11A) of a window sash
or frame all have substantially the same profile. Each element is provided with one
or more tenons (18A, 18B, 18C) at one end which correspond in shape and position to
an equal number of mortices (19A, 19B, 19C) at the other end so that the elements
can readily be joined to one another at the corners of the sash or frame. This should
simplify and decrease the cost of production and assembly of window frames and sashes.
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