filter casing leak test
( 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