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Input: WASHINGTON  Sept. 7— As his colleagues watched grimly   Senator Bob Packwood  announced  his  resignation today  hours after the Ethics Committee released a 10-volume indictment  much of it in  his  own hand  of  his  personal and official conduct.
But Senator Bob Dole raised the possibility tonight that  Senator Packwood  would not leave immediately. Mr. Packwood  an Oregon Republican  did not set an effective date for his resignation.
"The Bob Packwood we heard today is the Bob Packwood we've known over the years " said Mr. Dole  who looked as if a dark storm were playing out over his visage. Indeed  Mr. Dole  whose Presidential campaign has been losing some of its momentum lately  has been relying on Senator Packwood to steer the Republicans' sweeping economic program through the Finance Committee and shepherd it into law.
Photo:  Senator Bob Packwood of Oregon  resigned yesterday  heading off a vote to expel  him  for sexual and official misconduct. Members of  his  staff left the Capitol after Mr. Packwood's announcement. (Associated Press)(pg. D17)

THE PACKWOOD CASE