Aqualung distributes - Apeks and Suunto in the US, I believe they own Seaquest now. Deep See as well Scubapro owns and is trying to do away with the name Uwatec in favor of just Scubapro. Subgear is a "tropical" line of Scubapro. Scubapro also sells some regs to Tusa. Scubapro and Halcyon have been in sync for some time. The part numbers, forms, etc are the same. Now Halcyon makes stuff for Scubapro and of course H regs are Scubapros. Tusa/Tabata and Sea and Sea are all one Oceanic/Aeris/Hollis - all one XS Scuba / Sea Pearls / Highland - Worthington cylinders Sherwood/Akona/Genesis