20.A.1.Complete subsystems as follows:

a. Individual rocket stages, not specified in 2.A.1., usable in systems specified in 19.A.;
b. Rocket propulsion subsystems, not specified in 2.A.1., usable in the systems specified in 19.A.1., as follows:
1. Solid propellant rocket motors or hybrid rocket motors having a total impulse capacity equal to or greater than 8.41 x 10⁵ Ns, but less than 1.1 x 10⁶ Ns;
2. Liquid propellant rocket engines or gel propellant rocket motors integrated, or designed or modified to be integrated, into a liquid propellant or gel propellant propulsion system which has a total impulse capacity equal to or greater than 8.41 x 10⁵ Ns, but less than 1.1 x 10⁶ Ns;