Event:
Chuck Knolls retires as NFL coach after 23 years
More Notable Events on December 26:
1991 Jack Ruby's gun sells for $220,000 in auction
1990 Garry Kasparov beats Antatoly Karpov to retain chess championship
1982 TIME's Man of the Year is a computer
1968 Led Zeppelin's concert debut in Boston as opener for Vanilla Fudge
1878 1st U.S. store to install electric lights, Philadelphia
