Calculator Patents - Comptometer. ![Calculator Patents - Comptometer [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper bibtex @misc{noauthor_calculator_nodate,
title = {Calculator {Patents} - {Comptometer}},
url = {http://www.rskey.org/~mwsebastian/patents/patent_comptometer.htm},
urldate = {2017-12-29},
}
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