https://trid.trb.org/View/446531
THE SPOOL TREE: FIRST APPLICATION OF A NEW SUBSEA WELLHEAD/TREE CONFIGURATION - TRID
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https://www.offshore-technology.com/news/newsplexus-partners-to-co-develop-subsea-wellhead-system/
Plexus and partners to develop subsea wellhead system - Offshore Technology
Nov 21, 2011 - Oil and gas engineering services provider Plexus Holdings, in partnership with four major oil and gas companies, has signed a contract to develop and...
subsea wellheadoffshore technologyplexuspartnersdevelop