This, as noted, appeared at the beginning of virtually every kinescoped "live" program NBC sent to their affiliates who were unable to carry most of the network's live programming at the time they originally aired, usually because of conflicts involving another network's programming (the smaller affiliates in the Midwest and "hinterlands" were often the only station in their broadcast area, and sometimes carried more than one network's programs on their daily schedules)- or the "coaxial cables" carrying live programming were "tied up" among other stations- or, before September 1951, West Coast stations were unable to telecast live programs from the East Coast {and vice versa} because there were no "coaxial cables" connecting both coasts of the U.S. enabling "coast-to-coast" telecasts. Hence, kinescope film recordings of "live" shows were used by the networks to enable most of the country to see these programs from a week to as many as six weeks after the shows were originally telecast. In NBC's case, they needed to identify themselves at the start of these "kinnies" to let viewers know this was a "film recording" of a live program. Incidentally, the title was designed by Martin J. Weber, a freelance graphic artist who designed "slides" for NBC, CBS, and various advertisers at the dawn of network television. He passed away a few years ago, at a ripe old age [102, I believe].