Pre-paid telephone calling cards, not magnetically encoded

safety light curtains, in the nature of ultra-compact presence sensing devices

Scientific instrumentation for measuring electrical signals using diagnostic and electronic test and measurement instruments, namely, oscilloscopes and parts therefor; diagnostic and electronic instruments in the nature of signal generators, namely, analog and vector signal generators, waveform generators, function generators, pulse and data generators, arbitrary waveform generators, noise generators, and signal generation devices synthesizing electronic signals; electronic test and measureme...