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I found a brochure entitled "Profiled Belts" on Gates Mectrol web site and thought you might be interested. It's located at:
Gates Mectrol timing belts can be customized with welded-on profiles to meet the specific demands of your application. These profiles can be molded in virtually any configuration for holding, pushing, lifting, or actuating. This makes these profile belts ideal for your assembly, packaging, inserting and other automation equipment applications. Our molded profiles are produced in the same tough urethane and become an integral part of the belt by thermal bonding.