Post WWII, Page designed and produced the Kiddicraft Self-Locking Building Bricks,Maaike Lauwaert, Playing outside the box – on LEGO toys and the changing world of construction play, History and Technology, Volume 24, 221-237, 2008 that have been described as the "original LEGO". These were smaller, refined versions of the Interlocking Building Cube. Bricks could be stacked on each other and were held in place by studs on the top. The bricks also featured slits on their side that allowed panel-like doors, windows or cards to be inserted. He patented the basic design, a 2 × 4 studded brick, in 1947. This was later followed by patents for the side slits (1949) and the baseplate (1952), designs featured in exhibits at the Brighton Toy and Model Museum.
