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Patent:US2306641


Patent:US 2306641
Title:Photographic Exposure Calculator
Date:29.12.1942
Place:
Country:USA
Person:Rockwell Jr Harvey P
Company:Weston Electrical Instr Corp
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US2306641 (espacenet),  US2306641 (uspto)


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Aus der Patentschrift US2306641