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MIL-H-15021A (AMENDMENT 2), MILITARY SPECIFICATION, HOOKS, SNAP BOLT, SWIVEL-EYE, AND RINGS (4 NOV 1959)., This amendment forms a part of Military Specification MIL-H-15021A, 28 November 1950 has been approved by the Department of Defense, and is mandatory for use by the Departments of the Army, the Navy and the Air Force.MIL-HDBK-1884, DEPARTMENT OF DEFENSE HANDBOOK COATING: PLASMA SPRAY DEPOSITION (14 MAR 1998) [SUPERSEDING MIL-STD-1884A]., NOTE: MIL-STD-1884A(AT) has been redesignated as a handbook, and is to be used for guidance purposes only. This document is no longer to be cited as a requirement. For administrative expediency, the only physical change from MIL-STD-1884A(AT) is this cover page. However, this document is no longer to be cited as a requirement. If cited as a requirement, contractors may disregard the requirements of this document and interpret its contents only as guidance. The procedures covered by this standard are intended to ensure that plasma spray coating operations, either manual or automated, meet prescribed requirements. This process can be used on parts requiring protection from wear, heat, corrosion (with sealer), abrasion and to restore dimensionally discrepant parts. This standard covers the requirements for thermal coating by means of plasma spray deposition.