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US4185797A
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Target seeking gyro
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Target seeking gyro
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Sonic echo system
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Controlled undersea vessel
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Wafer type submersible motor for underwater device
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Armor piercing, fragmenting and incendiary projectile
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Coded card
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Electronic organ keying device
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Radially broadcasting speaker system
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Force measuring educational kit
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Jet propelled aerostat
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Optical sighting instrument utilizing two annular conical reflecting surfaces
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Torpedo craft
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Torque converting propeller
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Pulse responsive drum control and readout circuit
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Contact switch device
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Vortex gas turbine
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Superconducting films
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Superregenerative amplifier
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Proportional navigation system for a spinning body in free space
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