They had about 3 or 4 different models that came with different artwork. The speakers could hang on the wall or they sold floor stands for mounting like a regular floor speaker.
Bertagni moved to California in 1975. He died in 1992, with son taking over the Co. Sonance bought the Co. in 2002 or 2003. They are still making the "invisible speakers, and they cost a bundle (>$1K pair and up). http://www.sonance.com/