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PRESIDENT'S SON, CALVIN JR., 16, DIES AS PARENTS WATCH; End Comes at 10:30 P.M. in Walter Reed Hospital After Gallant Struggle. OXYGEN AS LAST RESORT Hope Finally Abandoned at 8 P.M., When the Boy Began to Sink Rapidly. MESSAGES OF SYMPATHY Mr. and Mrs. Coolidge Worn Out by Long Vigil -- Funeral May Be In Northampton, Mass. PRESIDENT'S SON, CALVIN JR., 16, DIES