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Patent:GB370060

Patent:	GB 370060
Title:	Apparatus for teaching arithmetic
Date:	07.04.1932
Place:
Country:	Great Britain
Person:	John James
Company:
Internal Links:
Keywords:	Lehrmittel
Link to the patent office: (without guarantee)	GB370060

Aus der Patentschrift GB370060

• DATUM: 07.04.1932
• TITEL: Apparatus for teaching arithmetic
• PERSON: JOHN JAMES