ScientificAmerican1891-04-18.jpg Radioland 1935-03ThumbnailsScientific American 1904-02-06Radioland 1935-03ThumbnailsScientific American 1904-02-06Radioland 1935-03ThumbnailsScientific American 1904-02-06Radioland 1935-03ThumbnailsScientific American 1904-02-06Radioland 1935-03ThumbnailsScientific American 1904-02-06
Centennial celebration of the establishment of the United States patent system.



Source: Steve Kirch, collector, and creator of a great website about SCIENTIFIC AMERICAN in the past

Restoration by: magscanner