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United States Patent 3468039
US Patent References:
/0641683.html
- - 0641683
Educational blackboard
- - 2740206
Stand for reading instruction and the like
- - 2867917
Blackboard bench
- - 2883769
Educational and recreational lessonaids and games with easel
- - 3263347
Inventors:
Dubbert, Karl E.
Publication Date:
09/23/1969
View Patent Images:
Download PDF 3468039
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Assignee:
Karl, Dubbert E.
Primary Class:
434/429
Other Classes:
434/430, 248/454, 108/166
International Classes:
A47B97/04
;
A47B97/00
; B43L5/02; A47B41/04
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