A means and method for rigidly elevating a structure includes a base member securable in the ground and which has a portion extending above the ground. A pole section, having a bore inside a lower end, and an upper end, can be stacked upon the base means upwardly by slip fitting the pole section onto...http://www.google.fr/patents/US5600537?utm_source=gb-gplus-shareBrevet US5600537 - Ballast box for integrated location of ballasts and electrical connections
Ballast box for integrated location of ballasts and electrical connections
