The Life images are not fully tagged so searches are variable... you will find a jumble of RCA and CBS color tv images..and worse repeating a search does not always bring the same results...eek...BUT these images appear to be of RCA technicians working with early triple tube RCA prototypes...
http://images.google.com/hosted/life...7a3b4413f5d421
http://images.google.com/hosted/life...29657e584fca56
and these are of CBS technicians working on the console seen in the foreground on the the color images
http://images.google.com/hosted/life...c526082503f2d7
http://images.google.com/hosted/life...96475c6b49e955
Note the test pattern chart on the wall.