Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gakushu Kenkyusha KK
Gakken Holdings Co Ltd
Original Assignee
Gakken Co Ltd
Gakushu Kenkyusha KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gakken Co Ltd, Gakushu Kenkyusha KKfiledCriticalGakken Co Ltd
Priority to JP8962275ApriorityCriticalpatent/JPS5149837A/en
Publication of JPS5149837ApublicationCriticalpatent/JPS5149837A/en
Publication of JPS5246134B2publicationCriticalpatent/JPS5246134B2/ja