The HMH (Hydril) brand offers industry-leading designs for blowout prevention in all surface and subsea applications. Introduced in the 1930s, they were the first to develop the hydraulically operated BOP and annular BOP. HMH (Hydril) maintains their status of being a top 3 blowout preventer manufacturer by persistently advancing the technology of a blowout preventer. HMH (Hydril) offers a multitude of blowout preventer rams that protect personnel and equipment by reliably monitoring and controlling surges of oil, gas and drilling mud from a well bore.