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Smith/Sperry Airspeed Indicator

Smith/Sperry Airspeed Indicator

Early Air-speed indicator, one of three examples.

Early Air-speed indicator, one of three examples.

Early Air-speed indicator, one of three examples.

Early Air-speed indicator, one of three examples.

(1) Airspeed Indicator, by Clift, London; (2) Pressure Head, Mk.IVA

Airspeed Indicator and Pressure Head