Patent 3479750 - 3479750

United States Patent

Patent Number 3,479,750

Issue Date:

Issued November 25, 1969

Current U.S. Class:	434/62
Current International Class:	G09B09/05 (20060101) G09B09/04 (20060101)
Current CPC Class:	G09B 9/05 (20130101)

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