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Application filed by 株式会社 ハーモニック・ドライブ・システムズfiledCritical株式会社 ハーモニック・ドライブ・システムズ
Priority to JP1988166386UpriorityCriticalpatent/JP2518934Y2/ja
Publication of JPH0287152UpublicationCriticalpatent/JPH0287152U/ja
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Publication of JP2518934Y2publicationCriticalpatent/JP2518934Y2/ja
Method of producing lightweight flexure resistant thin metal sheet, a set of rolls for use in cold rolling of plain sheet material, and sheet material having projection on both of its surface projection