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Priority to JP1987137587UpriorityCriticalpatent/JPH0649374Y2/ja
Publication of JPS6442725UpublicationCriticalpatent/JPS6442725U/ja
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Publication of JPH0649374Y2publicationCriticalpatent/JPH0649374Y2/ja
Sheet thickness detecting method and device therefor in bending machine, reference inter-blade distance detecting method and device therefor, and bending method and bending device