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August 1st,1930. Dr. Frederick B. Flinn, 438 W. 116th St., New York City. Dear Dr. Flinn: I have been strenuously trying to reach you during the past few days without much success. I am very enxious to get in touch with you, as we desire to use instruments for electroscopic examination in Newark the forepart of next week. If you are available should like to have you participate. Please call my house at South Orange 2-0408M, in case you receive this note, either Saturday or Sunday. Our offices are closed on Saturday all day. Sincerely yours, Vice President. HHBarker:RH