"2011Z"^^ . . "Lambertsen, Christian J."@en . "Diving engineering pioneer, inventor of first scuba device" . "2011-02-11Z"^^ . . . . . "Christian James Lambertsen"@en . "1917-05-15Z"^^ . "1917Z"^^ . . . . . . "Christian James Lambertsen (May 15, 1917 \u2013 February 11, 2011) was an American environmental medicine and diving medicine specialist who was principally responsible for developing the United States Navy frogmen's rebreathers in the early 1940s for underwater warfare. Lambertsen designed a series of rebreathers in 1940 (patent filing date: 16 Dec 1940) and in 1944 (patent issue date: 2 May 1944) and first called his invention breathing apparatus."@en . . . . .