ANEW portable air compressor which adapts the recognized advantages of two- stage stationary compressors and makes them usable in portable units has been announced by Ingersoll-Rand Co., 11 Broadway, New York City. Tests of the new ... This insures cooler valves and cylinder walls, and simplifies lubrication problems. A Waukesha ... This new two-stage air-cooled portable is made in four sizes which have piston displacements of 12S, 185, 250 and 370 cubic feet per minute.
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