에이티앤티(AT&T) - Techno twins

A national monopoly

Public utility commissions in state and local jurisdictions regulated the Bell System and all the other telephone companies. The Federal Communications Commission (FCC) regulated all service across state lines. These commissions controlled the rates that companies could charge, and the specific services and equipment they could offer.

AT&T increased its control of the telephone system through its leasing arrangements for telephones and telephone equipment made by its subsidiary, Western Electric. Like most telephones of the time in the United States, Western Electric-made phones were owned not by individual customers, but by local Bell System telephone companies — all of which were in turn owned by AT&T, which also owned Western Electric itself. Each phone was leased from AT&T on a monthly basis by customers, who generally paid for their phone and its connection many times over in cumulative lease fees. This monopoly made millions of extra dollars for AT&T, which had the secondary effect of greatly limiting phone choices and styles. AT&T strictly enforced policies against buying and using phones by other manufacturers that had not first been transferred to and re-rented from the local Bell monopoly. Many phones made by Western Electric thus carried the following disclaimer permanently molded into their housings: "BELL SYSTEM PROPERTY — NOT FOR SALE." Telephones were also labeled with a sticker marking the Bell Operating Company that owned the telephone.
From http://en.wikipedia.org/wiki/American_Telephone_and_Telegraph