Mil-std-202 standard (includes industry or association standards, individual manufactureer standards, etc.).
Mil-std-202-81349 specification (includes engineering type bulletins, brochures,etc., that reflect specification type data in specification format; excludes commercial catalogs, industry directories, and similar trade publications, reflecting general type data on certain environmental and performance requirements and test conditions that are shown as "typical", "average", "nominal", etc.). And eia-554-1-55342 standard (includes industry or association standards, individual manufactureer standards, etc.).