File:Otto Hofmann testing the sound accuracy for zinc pipes.jpg

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Otto_Hofmann_testing_the_sound_accuracy_for_zinc_pipes.jpg ‎(604 × 458 pixels, file size: 60 KB, MIME type: image/jpeg)

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English: Otto Hofmann testing the sound accuracy for zinc pipes. Date is approximate.
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Source Family photos mostly or the photographer is dead.
Author Family photos mostly or the photographer is dead.

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Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
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current20:44, 2 May 2021Thumbnail for version as of 20:44, 2 May 2021604 × 458 (60 KB)Barbara Yerby (talk | contribs)Uploaded a work by Family photos mostly or the photographer is dead. from Family photos mostly or the photographer is dead. with UploadWizard

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