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Keywords: Emergency Signaling Mirror - National Museum of American History - DSC06124.JPG en Exhibit in the National Museum of American History Washington DC USA This item is in the public domain because it is property of the national museum Photography was permitted in the museum without restriction 2013-02-13 10 57 41 own Daderot cc-zero Miscellany in the National Museum of American History Uploaded with UploadWizard Signalling mirrors |