| http://www.w3.org/ns/prov#value | - In electrical apparatus for indicating the pressure of pneumatic tires on motor vehicles, an oscillatory circuit carried by a wheel of the vehicle, means responsive to the pressure 01 the tire on said wheel for varying the tuning of said circuit, means including a source of oscillatory'energy carried by the body of the vehicle for indicating variations in said tuning, and means serving to electric
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