Bill continued as chairman until he died in 1986 at the age of 74.
He is expected to continue beyond then as chairman.
He continued as the managing director and chairman until his retirement in 1996.
He continued as chairman for 12 years under three more Presidents.
"My intention is to continue as chairman," he said at the news conference.
He will continue as chairman of the strategic planning committee until his retirement next year.
He continued as chairman of the board until 1973 and remained a director thereafter.
He continued as chairman of the supervisory council until 1961.
He retired in 1982 but continued as chairman of the executive committee until five years ago.
He will continue as chairman and a member of the executive committee.