This was invented by Carl Wolf and sold through his company Merriss Magic. It is an an improvement to Carl’s earlier effect Lock of Gilbraltar c. 1958. It became the standard by which many later similar locks were measured.The grandfather of modern mentalism locks was this ground-breaking offering, created by Carl Wolf. Wolf presented stage shows under the name Merriss. He attended local magic club meetings in Louisiana in the 1960s and came out with his commercial product in 1960. He call...