File:An Auxiliary Periscope for Submarines (cropped).png

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English: An Auxiliary Periscope for Submarines
Date
Source An Auxiliary Periscope for Submarines from The Electrical Experimenter, Vol. IV, No. 38.
Author E. E.

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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:An_Auxiliary_Periscope_for_Submarines_(cropped).png

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