( casing) stress testing tool
a few casing and more circulating
air casing
空气夹层
空气套
空气隔层
气隔套
烟囱外套筒
通风道
[空]气夹层
气套
气夹层
alignment of bottom casing and bearing seating
all casing and rotation drill
All casing concrete pile
All Casing Foundation Drilling Equipment
all casing grab drilling
all casing rotary drilling