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MPAA Rating

NR

Category

Documentary
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March of Progress: The Key System (1946)

Sub-Genres - Architecture & Design  |   Release Date - Dec 10, 1945 (USA - Unknown)  |   Run Time - 16 min.  |   Countries - United States  |   MPAA Rating - NR
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Synopsis by Rovi

Take a historical perspective of the Key System through the opening of the Bay Bridge.

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Keywords

engineering, bay, bridge [structure]