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together with Thomas Prohaska (University of Natural Resources and Life Sciences Vienna), Norbert Jakubowski (BAM Berlin) and others, I am currently editing a book on 'Magnetic sectorfield Inorganic Mass Spectrometry', which will be published by the Royal Society of Chemistry' this year. Within the scope of a chapter on the general history of sectorfield mass spectrometry we found the photo of Walter Kaufmann uploaded to wikipedia by you. Although you state, the picture is in the public domain, we would be very delighted if you agreed upon the publication of the picture in the above mentioned book as a person actually providing us with the photo.
Please let me know if there is more information needed by you to take this decision. Many thanks in advance and best regards from Austria, Ondrej