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This hydraulic turbine of Dr. Robert J. Nelson and associates of the National Bureau of Standards set the design pattern for the remarkable and successful high-speed, air-turbine handpiece developed by
Exhibits on the development of dentistry and dental surgery will display examples of tooth-filling and extracting tools, drilling apparatus from the early hand and foot engines to the first ultrasonic cutting instrument (1954), and the original contra-angle, hydraulic and air-turbine handpiece model  which revolutionized the field of instrumentation for dental surgery (with speeds of 200,000 to 400,000 rpm).
Miniature electronics and bearings -- used for portable radio and television; excessively small roller, needle and ball bearings used for such equipment as air-turbine dental drills.
The only air-turbine I’ve ever seen is the last-resort RAT ram-air turbine on the British Vulcan Bomber.