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Since the foundation of Yamazaki, it has been cooperating with construction companies to develope specific-purpose products. One example is the bolt used for hex socket guide rail co-developed between Yamazaki and Shutoko Maintenance East Tokyo in 2009. The product not only shortens construction period but also decreases operators' burden. Yamazaki's performance was highly-recognized by the industry, and then in July Shutoko Maintenance West Tokyo also decided to adopt the product. From now on, Yamazaki will sequently expand the list of  cooperating companies.