Patent model. Adding machine, Strode, 1868, patent no. 74,170. MA*252693.

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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