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Marine navigation beacon
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Marine buoy
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Side-emitting led marine signaling device
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Method and circuit for measuring pulse width
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Servo control with self calibrating preset
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Antenna grounding system
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Temperature compensated side lobe suppression
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Pulse width modulated switching power supply
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Electrical continuity sensing circuit
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Method and apparatus for simultaneously actuating navigational lanterns
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S-band coaxial slot array antenna
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Lampchanger
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Alternating current lampchanger control circuit
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Lamp filament configuration for use in a drum lens
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Position sensor for rotatable lamp changer turret
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Lampchanger for a light
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Apparatus for converting water wave energy to electric power
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Double acting turbine for converting wave energy of water to electrical power
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