American standard pipe thread
british standard pipe parallel
british standard pipe tapered
British Standard Pipe Thread
international pipe standard
standard standard of vo|
Pipe Prover
管式流量标定装置
管器
管子检验器
管式校准器
检管器
标准体积管
管道检验仪
bi-directional pipe prover
95th standard project standard
adoption of international standard and advanced oversea standard