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Developed in 1949, there are two versions, both of which have several designations. Powered the the P&W R-1340-57 powerplant, designations include:
- HO4S-1 & 2 under the U.S. Navy
- HO4S-2G under the U.S. Coast Guard
- HRS-2 & 3 under the U.S. Marine Corps
- H-19A under the U.S. Air Force
There is also the H-19B (HRS-3) version, powered by the Wright R-1300-3 engine.
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