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cellulose nitrate film
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still image
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Pasadena (Calif.)
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California Institute of Technology
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![California Institute of Technology Professor Royal W. Sorensen and three students at switch mechanism, [Pasadena], 1929](https://iiif.library.ucla.edu/iiif/2/ark%3A%2F21198%2Fzz002cm7cs/full/!200,200/0/default.jpg)
