Miniszewski patented an atmospheric device in 1904 that is not actually anthropomorphic and does not belong in this list. The idea looks very much like a submarine. The patent shows that the ball contains a mechanism for propulsion and valves with an air reservoir for raising and lowering the ball. An unusual design of which it is unknown if it has ever been executed. All information about this patent is welcome!
Therebreathersite was founded by Jan Willem Bech in 1999. After a diving career of many years, he decided to start technical diving in 1999. He immediately noticed that at that time there was almost no website that contained the history of closed breathing systems. The start for the website led to a huge collection that offered about 1,300 pages of information until 2019. In 2019, a fresh start was made with the website now freely available online for everyone. Therebreathersite is a source of information for divers, researchers, technicians and students. I hope you enjoy browsing the content!