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Patent:US1635270


Patent:US 1635270
Title:Drafting Ellipsograph
Date:12.07.1927
Place:
Country:USA
Person:David Grieve
Company:
Internal Links:Ellipsograph
Keywords:
Link to the patent office:
(without guarantee)
 US1635270 (espacenet),  US1635270 (uspto)


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Aus der Patentschrift US1635270