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Patent:US1790790


Patent:US 1790790
Title:Zero printing device
Date:03.02.1931
Place:Essen-on-the-Ruhr
Country:USA
Person:Breitling, Ernst (P)
Company:Fried. Krupp (P) AG
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Keywords:
Link to the patent office:
(without guarantee)
 US1790790 (espacenet),  US1790790 (uspto)


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