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Title: Edison's electric pen, c1876. Artist: Unknown
Caption: Edison's electric pen, c1876. One of the many inventions patented by the prolific American inventor Thomas Alva Edison, the electric pen, patented in 1876 was a form of copying device.
Credit: Album / Heritage Images / Keystone Archives
Image size: 4970 × 3516 px | 50.0 MB
Print size: 42.1 × 29.8 cm | 1956.7 × 1384.3 in (300 dpi)