Title:
INSTRUCTION BOOK
United States Patent 3503141
US Patent References:
Educational device
- - 1729518

Audio teaching device
- - 3352027


Inventors:
Schwartz, Louis E.
Publication Date:
03/31/1970
View Patent Images:
Download PDF 3503141 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
Schwartz, Louis E.
Primary Class:
434/317
Other Classes:
206/387.130, 281/31
International Classes:
G09B5/06; G09B5/00; G09B5/06




<- Previous Patent (DRIER FOR SHEET MATE...)   |   Next Patent (SELF-TESTING DEVICE) ->