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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Sikorsky CH-53 Sea Stallion. The CH-53 Sea Stallion is the most common name for the Sikorsky S-65 family of heavy-lift transport helicopters. Originally developed for use by the United States Marine Corps, it is in service with Germany, Iran, Israel, and Mexico.