3489  Ordnance and Accessories, Not Elsewhere Classified

Establishments primarily engaged in manufacturing ordnance and accessories,
not elsewhere classified, such as naval, aircraft, antiaircraft, tank,
coast, and field artillery having a bore more than 30 mm. (or more than
1.18 inch), and components. Establishments primarily engaged in
manufacturing small arms and parts 30 mm. (or 1.18 inch) or less are
classified in industry 3484; those manufacturing tanks are classified in
industry 3795; and those manufacturing guided missiles are classified in
industry group 376.