http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Standard symbols for welding, brazing and nondestructive examination
AWS Committee on Definitions and Symbols
Contains the standard which establishes a method of specifying certain welding, brazing, and nondestructive examination information by means of symbols, and gives detailed information and examples to provide for the construction and interpretation of these symbols.
prepared by AWS Committee on Definitions and Symbols under the Direction of AWS Technical Activities Committee.
"Approved by American National Standards Institute November 6, 1997."