On This Day In Telephone History January 26TH 1960 The United States - Puerto Rico submarine telephone cable opened. The 1,250 mile twin-cable system was built by AT&T Long Lines and the Radio Corporation of Puerto Rico (a subsidiary of IT&T). The System enabled U. S. operators to dial directly to all phones in San Juan. San Juan operators could dial direct on 90 percent of all calls to U. S. and Canada.

On This Day In Telephone History January 26TH 1960

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On This Day In Telephone History January 26TH 1960 The United States – Puerto Rico Submarine Telephone Cable opened. The 1,250 mile twin-cable system was built by AT&T Long Lines and the Radio Corporation of Puerto Rico (a subsidiary of IT&T). The System enabled U. S. operators to dial directly to all phones in San Juan. San Juan operators could dial direct on 90 percent of all calls to U. S. and Canada.