With reference to the 1978 Seagrave 100' rearmount from Bryn Mawr, we were all partially correct and all partially incorrect. After a phone call to Dan Decher, which resulted in phone calls to George Benigno and Bruce Anderson, with additional info coming from Al Powell, I finally found out the correct info:
Bryn Mawr sold it to Emigsville in 1985 who, in turn, sold it to Accokeek in the late 1990's. Accokeek replaced it with a Sutphen tower in 2002.
Bryn Mawr sold it to Emigsville in 1985 who, in turn, sold it to Accokeek in the late 1990's. Accokeek replaced it with a Sutphen tower in 2002.