A small quote from eRitchie's blog (that what Richard Sachs goes by on the interweb):
Witcomb U.S.A. was formed in 1971. It was a subsidiary of a succesful
outdoor-sports equipment Rep group named Sports East, Inc. The owner was
Ed Allen. He and his staff repped for Gerry, Trak (skis), Allen-A, Kelty, etc.
There's lots more info if you try here:
http://search.bikelist.org/?SearchString=witcomb%20usa