prov:value
| - The roller assemblies 304 may roll upon a track assembly 325, both of which may comprise a low friction material, such as a polymer (e.g., Polytetrafluoroethylene, Nylon, Polycarbonate, Polybutylene Terephthalate, Polyethylene Terephthalate, Polyetherimide, composites thereof, or the like) that may have a TEFLON coating or a MOLYKOTE coating.
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