Prety close or bang on in part,
It is:

A) Type 89 50mm HE Mortar(Type 89 small instanttaneos fuse)
B) Same as "A" Markings varried acording to referance.
C) Type 95 50-mm Smoke Mortar (Type 89 Small time Fuse)
D) Type 97 81 mm HE Mortar *
E) Type 94 90mm Semi Steal HE Mortar *
F) Type 100 81 mm HE Mortar (Type 100 Instantaneious fuse)
G) Type 89 50mm Incendery Motar
H) Posably a Type 10 Incendery Mortar.
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* Instaneious fuse
Referance source TM-1985-5 Japanese Explosoive Ordance.