West v Barnes (1791) 2 U.S. (2Dall.) 401
This is the first case where the Supreme Court heard oral arguments en banc. All six of the justices in 1791 heard oral argument.
Multiple Judges
in June 1969 warren burger was nominated as the united states chief justice and took the
reins of leadership from chief earl warren.
By 1975, the supreme court realized 4 more changes to the courts composition as justices
Fortas, black, Harlan, and Douglas retired.
Cosigners Board - Numerous Judges
This appears to be a court in search of a Chief Justice. Assuming the Justices were active at the time this co-signors board was signed one must eliminate that theory as Goldberg was gone in October 1965 and Abe Fortas was not there until October of 65.