Here is an original 1947 magazine ad for
Union Metal - Monotube Tapered Piles -
The Union Metal Mfg Co
Canton 5, Ohio
Shown in the photo is the constuction of the Rickenbacker Causeway, Miami, Fla., using Monotubes tapered steel piles 45' long with 18" butt diameter.
Size: full-page approx. 7½" x 10½" - lightly trimmed.
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