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"Diro" portable. air-cooled rotary compressor. The front end is extended to a blunt point in order to house the cooling blower an an integral unit without having to enlarge the superstructure as a whole. The proportions of the aperture in the front end have been carefully designed to permit an adequate intake of fresh air, whilst remaining in balance with the contours of the compressor set.
Klein, Schanzlin & Becker