Surgical clamp with “LifeLok” and “PILLING / USA U3” and “PAT 3608554” inscriptions.
Ref: Michael G. McGuinness and William H. Pilling, “Surgical Clamping Means,” U.S. Patent 3,608,554 (Sept. 28, 1971).
Pilling Company, Cardiovascular, Thoracic and General Surgery Instruments (Philadelphia, 1979), p. 245.
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