Printed or written appliances, e.g. text books, bilingual letter assemblies, charts

Full Title

Teaching not covered by other main groups of this subclass (teaching or practice apparatus for gun-aiming or gun-laying F41G3/26) > Foreign languages (with audible presentation of material to be studied G09B5/04) > Printed or written appliances, e.g. text books, bilingual letter assemblies, charts