Connection construction between the daily side of an opening in a particular wall and a frame to be installed here.
NL8800030A
Flap-open door or window for frame suspension - is secured by closure near closing side, and rigid pre-stressing strip forcing curvature and thus ends to seal against frame when shut
NL8603081A
Method for fixing window frame - by locating covering and sealing parts in opening, with positioning strips and carrying surfaces, and using anchor pre-attached to frame
NL8600119A
Connection construction between a front wall of an opening in a wall and a frame to be placed therein.
NL8401388A
Ventilation device to be placed in a door or window frame adjacent to an insulating window.
NL8301835A
Sound attenuating ventilation box for window frame - has mirror-symmetric parts connected by central plaster board panel
DE2801731A1
SOUND ATTENUATION BOX
DE2732633A1
Rotary knob operated ventilation plate - has disc rotated by knob to move slider over air entry slot (NL 23.1.78)
NL7701204A
Ventilation disc with oblong plate - has disc engaging in cross grooves, elastic narrow anti rattle strip engaging in plate groove pair
