File:Hydril Annular BOP Patent App.jpg

Summary
<!== == {{Information US Patent Application n° 11/829,697, Pulication n° 2008/0023917 A1]. Legend added.}}
 * Description={{en|1=Patent Application Drawing Showing an Annular-type Blowout Preventer, by Hydril Corporation,
 * Source=US Patent Application n° 11/829,697, Pulication n° 2008/0023917 A1
 * Author=Shafiq Khandoker
 * Date=Filed July 27, 2007
 * Permission=

Licensing
}}
 * other_versions=

/* */