<a href="https://en.wikipedia.org/wiki/Bell_of_Pennsylvania" class="extiw" title="w:Bell of Pennsylvania">Bell of Pennsylvania</a> logo for residential landline and long distance service. Used from 1969-1983.
<a href="https://en.wikipedia.org/wiki/en:Bell_System" class="extiw" title="w:en:Bell System"><span title="telephone service provider">Bell System</span></a>
This particular version was from a Bell of Pennsylvania telephone book from 1981.