variety of fuses, since early 1930s the grenade was used with the standard Zapalnik wz. Gr. 31 time fuse designed for the Defensive grenade wz.33. The grenade...
line of fuses led to the final design accepted into Polish service as Zapalnik wz. Gr. 31 ("Fuse Mark 1931, Granat factory"). The wz. 31 fuse was considered...