with combustion of a slow-burning charge, e.g. fumers, base-bleed projectiles

Full Title

Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding (F42B6/00 takes precedence) > Range-reducing or range-increasing arrangements; Fall-retarding means > Range-increasing arrangements (F42B10/34, F42B14/06 take precedence) > with combustion of a slow-burning charge, e.g. fumers, base-bleed projectiles