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Priority to JP1976064465UpriorityCriticalpatent/JPS556864Y2/ja
Publication of JPS52155701UpublicationCriticalpatent/JPS52155701U/ja
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Publication of JPS556864Y2publicationCriticalpatent/JPS556864Y2/ja
A method performed by a control device for changing a drill bit in a rock drilling unit, a control device of a rockdrilling unit, a rock drilling unit and a rock drilling rig