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Patent:US1839138


Patent:US 1839138
Title:Bookkeeping machine
Date:20.12.1931
Place:Essen-on-the-Ruhr
Country:USA
Person:Breitling, Ernst (P) Wilhelm Brauer Karl August Lehmann Bruno Bornkessel
Company:Krupp (P) AG
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Link to the patent office:
(without guarantee)
 US1839138 (espacenet),  US1839138 (uspto)


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