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Space ChargeElectron BeamMagnetic FieldControl SectionIndium AntimonideElectric FieldJunction TransistorsEmission MicroscopeCurrent DensityThermionic EmissionTravelling-wave TubePontryagin's Maximum PrincipleAutomatic ControlLinear Control SystemPotential DistributionAnalogue ComputerSmall SignalElectric and Magnetic FieldsSwitching FunctionOptimal Control
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