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N199 is used on 3.7 in QF Gun AA
HE shell Mk IC , 2C, 3C, 4C foil ; HE Shell Mk V C; Mk VII C with fuze 199 and gaine N11
Also on Practice shell Mk I C, 2C DEC, 1T, 2T
Also used on 4.5 inHE AA shell and sometime on 6 in and 9.2 in