Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
On Dec. 18, 1953, a five-year-old Brown Swiss cow was admitted to the Stange Memorial Clinic. The patient had previously been examined by the ambulatory clinicians, at which time she had shown few diagnostic symptoms. She was positive to the electronic metal detector test and was sent to the clinic as a "hardware" suspect.
Hyde, N. J.
"Infarction of the Duodenum,"
Iowa State University Veterinarian: Vol. 16
, Article 12.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol16/iss2/12