Public domain photos

The image shows a drawing of a pentagon with a hole in the middle of it, which is believed to be a representation of the pentagon from the 18th century. The drawing is accompanied by text, likely providing further information about the patent.

The image shows a drawing of a pentagon with a hole in the middle of it, which is believed to be a representation of the pentagon from the 18th century. The drawing is accompanied by text, likely providing further information about the patent.Open in library