@article{DA,
      author = {unknown},
      url = {http://digitalcollections.ohsu.edu/record/6826},
      title = {Artificial heart valve testing equipment},
      publisher = {unknown},
      abstract = {Digital scan of a 35mm slide. Image of a black-and-white  diagram of equipment developed by Lowell Edwards to test  the durability of Starr-Edwards artificial heart valves.  The diagram is titled: Medium Frequency Life Tester  (1700-3400 Pulses/Minute).},
      number = {DA},
      doi = {https://doi.org/10.6083/M45B013K},
      recid = {6826},
}