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As valves. PNEUMATIC TYRES. [Illustration: FIG. 151_b._] [Illustration: FIG. 85.--Vacuum brake "off."] [Illustration: FIG. 113.] [Illustration: FIG. 221.--The wrong key is depressed. (2.) Two Spagnoletti disc instrument, 212. Sparking-plug, _102_. Spectacles, use of.