ZENITH LABORATORIES, INC., ON BEHALF OF ITSELF AND ALL OTHERS SIMILARLY SITUATED, APPELLANT, v. CARTER-WALLACE, INC. No. 75-1570.United States Court of Appeals, Third Circuit.Argued November 18, 1975. Decided February 10, 1976. Page 509 [EDITORS’ NOTE: THIS PAGE CONTAINS HEADNOTES. HEADNOTES ARE NOT AN OFFICIAL PRODUCT OF THE COURT, THEREFORE THEY ARE NOT DISPLAYED.] Page 510 […]