Public domain
MacKay testifies in wire quiz. Senator James Couzens (left) of Michigan, Chairman of the Senate Interstate Commerce Committee and Clarence M. MacKay, President of the Postal Telegraph-Cable Company looking over a map in connection with the proposed Federal commission to regulate American communicati
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Credit lineMacKay testifies in wire quiz. Senator James Couzens (left) of Michigan, Chairman of the Senate Interstate Commerce Committee and Clarence M. MacKay, President of the Postal Telegraph-Cable Company lo. 1930-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.