Ohgushi's Peerless Respirator.

The article focuses on the history of the invention and use of the Ohgushi Peerless Respirator developed by Riichi Watanabe, Kanezo Ohgushi and Kyuhachi Kataoka. Topics include invention of the Respirator by Watanabe and Ohgushi, both of whom are from Japan, and the original version of the Respirator. Improvement of this original version by Watanabe and diving professional Kyuhachi Kataoka is also discussed. Salvage operations using the Respirator are then discussed.