VISITORS VIEW BASIC RESEARCH — During the visit yesterday of the top executives of Chas. Pfizer Co., Inc.,, including directors, to its Vigo Plant, many minutes were spent in the biologics laboratories, where extensive research in vaccines currently is under way. Shown above, from the left, are: Dr. Joel Warren, director of biologic research and development; John E. McKeen, president and also chairman of the board; Herman Poitras, vice president— production; Paul A. Benning Jr, manager of Vigo Plant, and Dr Ernest M. Weber, vice president—research and development.