Communication during Mackinac Bridge construction

An engineer talks on a two-way radio after departing one of the survey towers, Electronic reproduction of photograph.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: An engineer talks on a two-way radio after departing one of the survey towers
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1954 (approximate)