PG7607 piston pressure gauge
free piston engine
自由活塞发动机
自由活塞式内燃机
自由活塞式发动机
自由活塞动力机
Hydraulic free piston engine
dead-weight piston gauge
absolute pressure gauge
Accurate pressure gauge
acetylene(pressure)gauge
bell-operated pressure gauge
bellows type pressure gauge
blowout-back pressure gauge
bottom hole pressure gauge
bottom-hole pressure gauge
Bourden tube pressure gauge