Talk:General Discussion/@comment-24332640-20141114084214/@comment-25284995-20141114091012

91式高射装置 and 94式高射装置 are rangefinder (plus pelorus) equipments for calculating distance in azimuth and angle between the gun and targets (planes). High-angle guns then use the targets data sent from these equipments.

I think these are the new buff item for this game, type 91 and type 94  expression anti-aircraft equipment.