| http://www.w3.org/ns/prov#value | - Although the sensor block 502 back rail 504 and bottom rails 506a, 506b, can be formed of a number of materials, including steel or other metal, resins, composites, and the like, it is preferred, in one embodiment, to form the back rail 504 of a plastic, such as a polyamide polymer, e.g., nylon 66.
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