sight glass
观察镜
观察窗
显示玻璃
玻璃液位计
玻璃液面计
窥视镜
视镜
窥镜
检视窗
量位计
the tank wall plate of LNG storage tank
150 MN hydraulic forging press
20 MN NC frame type of hydraulic press
3 Way 6 Port Hydraulic Valve
3-boom hydraulic rock drilling jumbo
700 MW hydraulic turbine
a full power hydraulic braking system
A new valve of electric hydraulic control exchange direction