Cal Security Enterprises

The "CAL Double-Bolt Lock" received a U.S. patent. The patent states that "No similar lock to the one disclosed in the present invention has ever been suggested, designed, constructed or made available to the United States market before."
CAL Tech International has grown to become a leading manufacturer of locks for the European door and window market. Over 4 million locks of the "Double-Bolt" design have been manufactured and sold in Greece.