Patents Assigned to National Grondbezit N.V.
  • Window-frame having a sash-window arranged in it
    Patent number: 4327524
    Abstract: A metal sash-window has been slidably arranged in a wooden window-frame without the intermediary of a metal window-frame mounted in the wooden window-frame.
    Type: Grant
    Filed: February 29, 1980
    Date of Patent: May 4, 1982
    Assignees: National Grondbezit N.V., Agterhof Beheer N.V.
    Inventor: Jan G. van der Laan