This patent discloses a method and apparatus for activation of services in a concrete floor of an office building from below floor slab distribution systems. Void-forming boxes that are secured to a conventional metal deck sheet and surrounded by the concrete floor slab provide chambers in which in-floor...http://www.google.de/patents/US5467565?utm_source=gb-gplus-sharePatent US5467565 - Method and apparatus for improved activation of services in an office building floor
