You mean RF Concepts?
Have you checked at the Boat Anchors Manual Archive? http://bama.sbc.edu/
and their link to other manual sources http://bama.sbc.edu/free.htm
QST had reviews of some other RF Concepts products in the late '80's FWIW.
Also this, from ARRL, Jan 2001 may help:
Amateur Radio industry veteran Everett L. Gracey, WA6CBA, of Reno, Nevada, has joined LDG Electronics Inc of St Leonard, Maryland, as its worldwide Amateur Radio dealer sales representative. <snip> Gracey co-founded Mirage Communications in 1979 and co-founded RF Concepts in 1986.--LDG news release
And from FCC:
GRACEY, EVERETT L
3288 ALUM CREEK COURT
RENO, NV 89509