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- University of California, Los Angeles. Library. Department of Special Collections[remove]23
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California Institute of Technology
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University of California, Los Angeles. Library. Department of Special Collections
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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)
