![](http://www.alamy.com/thumbs/6/AC49E53C-FA98-4BD4-9A15-9F1E58C14100/2RX2EDJ.jpg)
Patent model. Adding machine, Strode, 1868, patent no. 74,170. MA*252693.
Size: 2970px × 2133px
Photo credit: © History of America / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: america, american, americana, ancient, archival, archive, artefact, artistic, bygone, cultural, culture, editorial, era, gallery, heritage, historic, historical, history, mathematics, medicine, museum, nostalgia, nostalgic, object, photography, science, states, traditional, united, usa, vintage