![Thomas Edison's electric pen with its wet cell battery. The pen was designed to duplicate documents and went on sale in late 1875 but because of the high maintenance battery its commerical Thomas Edison's electric pen with its wet cell battery. The pen was designed to duplicate documents and went on sale in late 1875 but because of the high maintenance battery its commerical](https://c8.alamy.com/zooms/9/d7ed5c3cbaba4d84b64b4ff0259ccfab/2her5pp.jpg)
Thomas Edison's electric pen with its wet cell battery. The pen was designed to duplicate documents and went on sale in late 1875 but because of the high maintenance battery its commerical
![Sold Price: Edison Electric Pen and Edison Mimeograph Duplicator, 1875 (Starting Price EUR 6750) - May 6, 0110 10:00 AM CEST Sold Price: Edison Electric Pen and Edison Mimeograph Duplicator, 1875 (Starting Price EUR 6750) - May 6, 0110 10:00 AM CEST](https://image.invaluable.com/housePhotos/AuctionTeamBreker/18/285418/H1256-L16683349.jpg)
Sold Price: Edison Electric Pen and Edison Mimeograph Duplicator, 1875 (Starting Price EUR 6750) - May 6, 0110 10:00 AM CEST
![An Extremely Useful Invention': Edison's electric pen and the unravelling of old and new media - Peter Unwin, 2019 An Extremely Useful Invention': Edison's electric pen and the unravelling of old and new media - Peter Unwin, 2019](https://journals.sagepub.com/cms/10.1177/1354856519846790/asset/images/large/10.1177_1354856519846790-fig4.jpeg)