Description
This is a reproduction of the original Patent for a Spatial Logical Toy. It was invented by Rubik, Ernoe and filed on August 3, 1981. It was issued on March 29, 1983 by the United States Patent and Trademark Office.
This is a reproduction of the original Patent for a Spatial Logical Toy.
It was invented by Rubik, Ernoe and filed on August 3, 1981. It was issued on March 29, 1983 by the United States Patent and Trademark Office.