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When I worked at a Spancrete in 1978, semis would arrive with what I can best describe as a cylindrical covered hopper. These were aluminum, or maybe stainless? and had maybe 3 conical hopper bottoms that were connected with a large tube. This was hooked up to the plant, and perhaps air was used to pu***he powdered cement through the attached hose to the plant. They would rap on the sides at the end of unloading to jar loose any cement clinging to the inside walls. This tube and hose hookup was 6-10" in diameter, I am guessing/trying to recall. I watched, but did not actually unload, and that was a while ago. <br />If you are looking for a much different era, like the 50's or earlier, I don't have a clue. I imagine today things are done much the same. <br />Dean
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