Who knows Chain Belt Company???????
Todd 04-12-2007
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Pumpcrete Practice. (Concrete Pumping) A Manual of Pipe Line Concreting Methods by Chain Belt Company (Hardcover - 1948)
DIGGER 04-14-2007
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They maybe used to be called Rex Chainbelt. Really big pumps, like a huge Mayco C30HD. Check out Hoover Dam details.

Pipeline was 6 inch and 8 inch.