GGG-C-291A, FEDERAL SPECIFICATION: CHALK LINE AND REEL (SELF-CHALKING) (01-MAR-1963)

GGG-C-291A, FEDERAL SPECIFICATION: CHALK LINE AND REEL (SELF-CHALKING) (01-MAR-1963)., This specification covers a chalk line and reel of the self-chalking type used for marking construction lines.