Type 190 Ballistics Longitude-Latitude Photographic Plate (BLL, photoplate) is dedicated for night photography of luminous ballistics of conventional or strategical arms. 190弹道经纬照相干版适用于各种常规兵器和尖端武器曳光弹道的夜间拍摄[*]。Type 190 Ballistics Longitude-Latitude Photographic Plate (BLL, photoplate) is dedicated for night photography of luminous ballistics of conventional or strategical arms. 190弹道经纬照相干版适用于各种常规兵器和尖端武器曳光弹道的夜间拍摄[*]。