Self-propelled hydraulic sweepers are familiar sights on city and suburban streets. Although they perform what appear to be relatively unsophisticated and menial jobs, the sweepers accomplish these tasks in minimal time. In one pass, they can sweep up stones, dirt, leaves, paper goods, glass, metal parts, and other waste materials. Sweeper brushes move the material from the street surface and direct it into the machine. A powerful fan inside the machine works like a giant vacuum cleaner to blow the debris into a collection hopper. The hopper is later dumped at a transfer station for subsequent disposal.
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