Window sashes, door leaves, or like elements for closing; wall or like; openings; Layout of fixed or moving closures, e.g. windows; in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
Evacuating or filling the gap between the panes; ; Equilibration of inside and outside pressure; Preventing condensation in the gap between the panes; Cleaning the gap between the panes
