75896991
Jan 14, 2000
Secure timing systems, comprised of computers, computer hardware memory cards, blank integrated circuit cards, encoded integrated circuit cards containing programming used to provide an accurate and secure time-stamp, electronic timers, modules for time-stamping, hardwired alarm processing units, wireless alarm processing units, sensors, central monitoring units, control software for timing systems, software for encoding secure communications, and software for providing secure time-stamps
Electrical and Scientific Apparatus