Patents   Great Britain  

Patent:GB104392

Patent:	GB 104392
Title:	Device to enable Children to Build Up the Multiplication Tables.
Date:	05.03.1917
Place:
Country:	Great Britain
Person:	Green Ernest George, Dyson Percy Albert
Company:
Internal Links:	Lehrmittel
Keywords:
Link to the patent office: (without guarantee)	GB104392

Aus der Patentschrift GB104392

• DATUM: 05.03.1917
• TITEL: A Device to enable Children to Build Up the Multiplication Tables.
• PERSON: GREEN ERNEST GEORGE