Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Weapons and Ammunition (hierarchy name)
5. weapons
6. armaments
7. projectile weapons
8. [projectile weapons with explosive propellant]
9. firearms
10. small arms
11. [small arms by form]
12. machine guns

Anotations

Scope note:

Machine guns first developed by Dr. Richard J. Gatling in 1861, featuring a cluster of revolving barrels equally spaced around a central shaft, a magazine to feed them, and an action by which the cartridges were chambered and fired. Early models were powered by a hand crank, later ones by electricity or gas, attaining a firing rate of up to 3000 rounds per minute.