clear zone zone

the alternative occurrence of fractured zone and non-fractured zone

trade-wind zone [= zone of trade wind]

zone by zone upgoing

100p% firing level

4 corner tangential firing

50% firing energy

accuracy of firing

accuracy of firing data

air gun firing chamber

alternate firing

angle of firing

Annulus Pressure Firing

approved shot firing apparatus

arc firing

area with easy firing and explosion

automatic release mechanical firing head

Back firing

batch firing system

Beyond once firing