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Automatic video switching device
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Dual polarization signal cancellation system
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Semi-automatic ground controlled appoach system
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Follow-up system
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Demodulator-modulator
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Electronically regulated power supply
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Phase meter
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Frequency discriminator
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Radiant energy receiver
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System for countermeasures
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Apparatus for automatic gain control
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Air traffic control system
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Velocity servosystem for memory-point tracking system
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Radiant energy receiver system
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System and method for remote radar data transmission and coordinated assembly at a central station
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Voltage divider setting device
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Method of and apparatus for identifying aircraft during ground controlled approach
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Identification system
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Air traffic schedule monitoring method and system
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Degenerative feedback amplifier utilizing zener diode
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