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Exhibitor Products | International Powder & Bulk Solids . The 4B Milli-Speed™ has a 4 – 20 mA linear output signal and is designed to detect belt slip, belt underspeed, stop motion, low speed or zero speed on bucket elevators, conveyors, airlocks, mixers, fans and many other rotating machines. Concrete The widespread use of concrete in many Roman structures ensured that many survive to the present day. The Baths of Caracalla in Rome are just one example. Many Roman aqueducts and bridges, such as the magnificent Pont du Gard in southern France, have masonry cladding on a concrete core, as does the dome of the Pantheon. Pavement History Introduction A brief view of how pavement design, construction and performance has evolved should help provide perspective on present and, [.]    Read More

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