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Patent:US2235590


Patent:US 2235590
Title:Apparatus for Determining Proper Exposure in Making Photographic Prints
Date:18.03.1941
Place:
Country:USA
Person:H. P. Rockwell, Jr.
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US2235590 (espacenet),  US2235590 (uspto)