Thank you Dave! Don On 19 Sep 2011, at 4:18 PM, NNN7DXB at aol.com wrote: US Army CommCenter, Davis, CA, 1960s and 70s: http://www.militarymuseum.org/CommStaDavis.html (scroll down to about the 2nd photo of the interior of the tape relay; typical Army and Navy large CommCenter installation) Dave