On This Day in Telephone History June 7TH 1951 AT&T and IT&T signed a cross-licensing patent agreement. Western Electric telephone parts became completely interchangeable with IT&T telephone parts.

On This Day in Telephone History June 7TH 1951

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On This Day in Telephone History June 7TH 1951 AT&T and IT&T signed a cross-licensing patent agreement.

Western Electric Telephone parts became completely interchangeable with IT&T Telephone parts.

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