He invented and patented a series of combinationlocks with lead balls to block x-rays, in conjunction with special nylon wheels to prevent them from observed.
But Dennis Henigan, legal director of the Centre to Prevent Handgun Violence, replies that gun manufacturers already have access to low-tech safety devices, such as combinationlocks.
The thieves, headed by Leonardo Notarbartolo, reportedly managed to penetrate some of the most advanced security measures, including hi-tech combinationlocks, motion and heat sensors -- and 18-inch steel doors.