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US4326189A
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Aircraft control/guidance display and mechanism for enroute and landing utility
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US3907223A
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Voice-directed aircraft navigation system and direction finder
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US3307191A
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Aircraft blind landing device and flight director system
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US3292176A
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Height indicating system for aircraft
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US2791254A
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Resilient disc type seed sheller
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US2685226A
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Aircraft flight control optical indicating device
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US2492969A
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Night and all-weather ground trainer
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US2393310A
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Navigational instrument
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US2396687A
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Airplane turn indicator
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US2412206A
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Sensitive switch control apparatus
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US2420656A
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Efficiency measuring device
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US2358793A
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Navigation instruction device
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US2388252A
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Slide member for measuring and marking devices
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US2343281A
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Stall, skid, and slip warning device for aircraft
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US2326764A
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Navigation trainer
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US2313734A
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Temperature compensated bubble for panoramic sextants
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US2266741A
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Panoramic sextant
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US2265149A
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Photoelectric device for opening or closing a switch at any selected altitude
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US2315501A
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Automatic glide and/or climb control
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US2253508A
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Navigation system for guiding aircraft
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