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| Keywords: ConstantOfGravitation 002.jpg Outside control and observation apparatus for crystal weighing ca 1924 National Institute of Standards and Technology 1924-01-01 National Institute of Standards and Technology The images in the Constant of Gravitation 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 Gravitation Mass and weight | ||||
