4. Aeronautics and astronautics
  5. Aircraft power plants
  6. Mounting

R. H. Sproule

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Adaptive digital filter which is responsive to the rate of chang

Boots – shoes – and leggings
Patent

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Aircraft wheel hubcap

Land vehicles: wheels and axles – Wheel – Hub
Patent

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Apparatus and method for displaying aircraft flight path angle o

Communications: electrical – Aircraft alarm or indicating systems – Nonalarm flight indicator
Patent

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Apparatus and method for ejecting matter from an aircraft

Aeronautics and astronautics – Aircraft structure – Material discharging and diffusing
Patent

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Apparatus and methods for automatically maintaining aircraft tra

Boots – shoes – and leggings
Patent

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