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US4638496A
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Secure reliable transmitting and receiving system for transfer of digital data
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US4602246A
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Intruder detector apparatus
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Comprehensive intruder-environmental hazard detection, control, and action system
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US3166726A
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Automatic sweep tuning circuit with means to change the range of reactance after each sweep through a sub-band
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Active comb filter
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US3054965A
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Automatic bandwidth control with a.f.c.
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US2963654A
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Staircase generator with means including clamp for adjusting steps without interaction between consecutive staircases
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US2942107A
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Read-out system
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US2908868A
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Electrical frequency selective circuit
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US2868979A
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Variable reactance tube circuit
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US2868973A
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Decade frequency generator
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US2563841A
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Frequency divider
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US2627033A
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Frequency meter
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US2638273A
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Dual-channel counting rate meter
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US2597870A
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Noise elimination system for pulse signal receivers
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US2638543A
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Squelch circuit
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US2580431A
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Communication system
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