CHALK BOARD WITH GUIDE LINES AND METHOD OF MAKING SAME

Title:

CHALK BOARD WITH GUIDE LINES AND METHOD OF MAKING SAME

United States Patent 3486246

Inventors:

Johnson Jr., George C.

Application Number:

US3486246DA

Publication Date:

12/30/1969

Filing Date:

11/13/1967

Export Citation:

Assignee:

ENAMEL PRODUCTS CO THE

Primary Class:

434/425

Other Classes:

427/258

International Classes:

B43L1/06; (IPC1-7): B43L1/10

View Patent Images:

US Patent References:

3238643	Kinesthetic teaching device and method	1966-03-08
2643466	Game instruction apparatus	1953-06-30
1898500	Enamel decorating process	1933-02-21
1434989	Blackboard	1922-11-07
1371430	Writing-tablet for the blind	1921-03-15

Foreign References:

GB117420A

1918-07-18