1. Breakage of Forceps Valve Cover and Its Introduction into a Patient
Thomas R. Ware, M.D., Ross L. Ristagno, M.D., F.C.C.P. 
CHEST 
Volume 100, Issue 6, (December 1991)
DOI: /chest a
Copyright © 1991 The American College of Chest Physicians Terms and Conditions

2. FIGURE 1
Photograph of the broken forceps valve cover (bottom) and foreign body retrieved (at right). A newer forceps valve cover (top) is shown for comparison.
CHEST  , DOI: ( /chest a)
Copyright © 1991 The American College of Chest Physicians Terms and Conditions