Isolated Masonry Piers 1. You may use hollow core concrete masonry units (concrete blocks) to build isolated masonry piers if the units are at least (â¥) 8 inches thick and not longer than (â¤) 3 times the unit thickness.
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Developed from the VS-300, Sikorsky's R-4 was the first large-scale mass-produced helicopter, with a production order for 100 aircraft. The R-4 was the only Allied helicopter to serve in World War II, when it was used primarily for rescue in Burma, Alaska, and other areas with harsh terrain.