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Title: Patent section line ruler, stamped "Apps" and with the trade [Go to resource]
Description: Patent section line ruler, stamped "Apps" and with the trade mark of E.O. Richter and case. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: rule (line) Source: Science Museum Creator: Apps, Alfred Identifier: 1911-198 Go to resource More Like this...
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