34890 - Ordnance & Accessories (Miscellaneous)
34891 - Guns, Howitzers, Mortars & related equipment, >30mm
3489121 - - Guns, Howitzers & Mortars, Assembled & Recoilless rifles
3489151 - - Turrets (except aircraft turrets & Aircraft turret drives) Mounts & Carriages (except self-propelled)
3489171 - - Parts & other related equipment for Heavy weapons
3489199 - - Guns, Howitzers, Mortars & related equipment (Miscellaneous)
34892 - Ordnance & Accessories (General) such as Rocket projectors, Line throwing guns, Flame throwers, Torpedo tubes, etc.
3489XX0 - - Ordnance & Accessories (Miscellaneous - Volume)
3489XX2 - - Ordnance & Accessories (Miscellaneous - Speciality)