Method of forming letters and numbers readable by the blind
United States Patent 3197889
US Patent References:
/0506718.html
- - 0506718
/1936089.html
- - 1936089
Braille writing device
- - 2850812
/0506718.html
- - 0506718
/1936089.html
- - 1936089
Braille writing device
- - 2850812
Inventors:
Micropoulou, Evangelia A.
Publication Date:
08/03/1965
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Assignee:
Micropoulou, Evangelia A.
Primary Class:
International Classes:
G09B21/02; G09B21/00
Foreign References:
| DE457017C | ||||
| FR977209A |