Seventy-five years ago, these servicemen with the Patton Brothers firm of Benton Harbor, Michigan, speed up television repairs thanks to the use of modern test equipment. Because of the 6 MHz bandwidth of the TV signal, this includes the need for a sweep generator covering the entire TV broadcast range, with a sweep of at least 10 MHz.

The device is discussed in detail in the September 1949 issue of Radio News, on whose cover this illustration appears.