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| Keywords: ChartersOfFreedom 020.jpg Dr Roy W Wampler of the Libbey-Owens-Ford Glass Company polishing one of the cover plates of the glass and metal assembly of the enclosure housing the Declaration of Independence Dr Luther H Evans Librarian of Congress watches The glass plates of the enclosures were made of special tempered glass and soldered to a lead strip sealing the documents into an airtight envelope National Institute of Standards and Technology National Institute of Standards and Technology The images in the ChartersOf Freedom Photographic Collection are in the public domain and are not subject to copyright in the United States However please pay special attention to the individual works to make sure there are no copyright restrictions indicated Individual works may require securing other permissions from the original copyright holder Use of the images from NIST Digital Collections is not restricted but a statement of attribution is required Please use the following attribution statement National Institute of Standards and Technology Digital Collections Gaithersburg MD 20899 PD-USGov National Bureau of Standards National Institute of Standards and Technology Libbey-Owens-Ford Company United States Declaration of Independence | ||||
