OPEN SAFETY PIN IN AN INFANT'S STOMACH AND DUODENUM

C. Winfield Perkins
1917 Journal of the American Medical Association  
attaches easily to the uprights. On the crossbars of this structure are mounted two sliding locks, for fixing the lid hooks after the lids have been retracted.
doi:10.1001/jama.1917.25910520003011b fatcat:zzptfmpx65ddpnblmrcl3zznya