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
Assignee:
ENAMEL PRODUCTS CO THE
Primary Class:
Other Classes:
427/258
International Classes:
B43L1/06; (IPC1-7): B43L1/10
View Patent Images:
US Patent References:
3238643Kinesthetic teaching device and method1966-03-08
2643466Game instruction apparatus1953-06-30
1898500Enamel decorating process1933-02-21
1434989Blackboard1922-11-07
1371430Writing-tablet for the blind1921-03-15
Foreign References:
GB117420A1918-07-18