Abstract: The invention relates, on the one hand, to a brush (1) for a scrubbing, sweeping and/or polishing machine for mechanical cleaning of several surfaces that are separated from each other by means of grooves and/or joints, such as, inter alia, paving stones, tiles, Bangkirai and/or building bricks, wherein the scrubbing, sweeping and/or polishing machine is provided so as to move the brush in a plane that is substantially parallel to the said surfaces that are separated from each other, and a scrubbing, sweeping and/or polishing machine provided with one or more brushes (1), the brush (1) being provided with at least one set of polishing bristles (2) for cleaning or polishing the surfaces; at least one set of joint bristles (3) for cleaning the grooves and/or joints between the surfaces; and the polishing bristles (2) having a length that is shorter than the length of the joint bristles (3).

Abstract: A single line, pressure-pressure, pneumatic tube system having a pair of terminals each being capable of dispatching or receiving carriers. Each terminal provided with a blower to provide air flow, tubing connecting the two terminals, a pair of inline valves in the tubing, one facing in one direction and the other in the opposite direction. The valves being so designed that the one near the dispatching terminal automatically closes to permit build up of pressure and the one near the receiving terminal opens to exhaust pressure and slow the travel of the carrier as it approaches the receiving terminal, the terminal having a bleed-off orifice to assure carrier arrival.