@article{DA,
      recid = {4657},
      author = {General Electric Company},
      title = {Coolidge x-ray tubes},
      address = {1930},
      number = {DA},
      abstract = {Digital photograph of two Coolidge GE x-ray tubes, set on  a gray counter. A ruler has been placed in the foreground  for size comparison.},
      url = {http://digitalcollections.ohsu.edu/record/4657},
      doi = {https://doi.org/10.6083/M4CC0Z3Z},
}