Visual Aid and Display Device Patent Art

Visual aid and display device was invented by D. E. Harding. This patent was issued on June 5, 1979, by the United States Patent and Trademark Office.

This patent has been restored and digitally enhanced. We have removed as many defects or unwanted artifacts as possible while maintaining the integrity of the original document.

You will download:
2 JPG images (1 Black, 1 White background);
Size: A4 – can be easily expanded to A3 size without losing the resolution;
High resolution 300 DPI, ensuring the best quality when printed;