I've done a good bit of research, mainly on Google, found a few more details on some of the signatories. Updated list below. Biggest question-mark is Dennis A. Balin, I haven't been able to find any Gibsons signed by him, although I can find Flatirons. Also not sure who signed between 1981 and 1986, although I found a guitar signed by Jerry Rowland in 1984 so possibly he was still signing mandolins back then as well. I could be missing more but there were often multiple signatories at the same time so it's hard to spot the gaps.
Lloyd Loar (1922-1924) *
Stanley E. Rendell (1970-1975) *
Aaron Cowles (1978-1984)
Wilbur Fuller (1978)
Richard Doan (1978-1980) *
Herman Meints (1979-1980)
Jerry Rowland (1981)
Jim Triggs (1986-1989)
Steve B. Carlson (1986-1993) *
Dennis A. Balin (?)
Phil Brug (1993-1994)
Larry Barnwell (1994-1995) *
Bruce D. Weber (1993-1997)
Paul Schneider (1997-1998) *
Simeon C. Daley (1998-2001)
Charlie Derrington (1998-2004) *
Danny Roberts (2001-2005) *
Casey Q. Sullivan (2005-2007)
David W. Harvey (2008-2014) *
If followed by a * I've placed a picture of the label below. If anyone has a picture of a label signed by the others please share!
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