Question: The aga saga is named for what invention created by Swedish physicist Gustaf Dalén?
Context: Nils Gustaf Dalén (30 November 1869 – 9 December 1937) was a Swedish Nobel Laureate and industrialist, the founder of the AGA company and inventor of the AGA cooker and the Dalén light.  In 1912 he was awarded the Nobel Prize in Physics for his "invention of automatic regulators for use in conjunction with gas accumulators for illuminating lighthouses and buoys". The Aga saga is a subgenre of the family saga genre of literature.  The genre is named for the AGA cooker, a type of stored-heat oven that came to be popular in medium to large country houses in the UK after its introduction in 1929.  It refers primarily to fictional family sagas dealing with British "middle-class country or village life".  The nickname "Aga saga" is sometimes used condescendingly about this type of fiction.  The term was incorporated into the "Oxford Companion to English Literature" in 2000. Eva Wilhelmina Julia von Bahr-Bergius, (16 September 1874 – 28 February 1962) was a Swedish physicist and teacher at a folk high school.  She was the first woman in Sweden to become a docent in physics.  She is known for her contact with and support of the poet Dan Andersson, for her friendship and support of the physicist Lise Meitner, and as a Catholic writer. Torsten Karl Adolf Magnusson (24 December 1907 – 24 November 1987) was a Swedish physicist and defense research scientists.  Magnusson was Director-General of the Swedish National Defence Research Institute (FOA) from 1968 to 1974 and was one of the prominent figures of the Swedish nuclear weapons program. AGA AB, previously "AB Gasaccumulator" and "AB Svenska Gasaccumulator", was a Swedish industrial gas company founded in 1904.  Nobel Prize laureate Gustaf Dalén was instrumental in the success of the company.  Important inventions included the AGA cooker and the Dalén light.  In the 1990s AGA conceived and developed HiQ for specialty gases.  In 2000, AGA was integrated into Linde AG. Knut Johan Ångström (12 January 18574 March 1910) was a Swedish physicist.  He was the son of physicist Anders Jonas Ångström and studied in Uppsala from 1877 to 1884, when he received his "licentiat"-degree, before going for a short time to the University of Strassburg (Strasbourg) to study with August Kundt.  Coming back to Uppsala, he completed his doctoral degree and was appointed lecturer in physics at the new university college in Stockholm (now Stockholm University) in 1885.  After a few years working there, he returned to Uppsala in 1891 and received the professorship of Physics in 1896. The Oskar Klein Memorial Lecture at Stockholm University, dedicated to the memory of the Swedish physicist Oskar Klein (1894-1977), is held annually since 1988 by a prominent physicist, who also receives the Oskar Klein Medal.  The arrangement are sponsored by the university and the Nobel Committee of the Royal Swedish Academy of Sciences. Agamassan is a porous substrate used to safely absorb acetylene and thus allow the transport, storage and commercial exploitation of the otherwise unstable gas.  It was developed and patented by the Swedish Nobel Laureate and industrialist Gustaf Dalén.  Dalén was prominent in developing applications for acetylene. A sun valve ("Swedish: solventil", "solar valve") is a form of flow control valve, notable because it earned its inventor Gustaf Dalén the 1912 Nobel Prize in Physics. The AGA cooker is a heat storage stove and cooker, which works on the principle that a heavy frame made of cast iron can absorb heat from a relatively low-intensity but continuously burning source, and the accumulated heat can then be used for cooking.  Originally heated by slow-burning coal, the Aga cooker was invented in 1922 by the Nobel Prize–winning Swedish physicist Gustaf Dalén (1869–1937), who was employed first as the chief engineer of the Swedish AGA company (Swedish "Aktiebolaget Svenska Gasaccumulator", English "Swedish Gas Accumulator, Limited").  The cookers were first imported to Britain in 1929, and were first manufactured there under licence in the early 1930s.  The cast-iron parts were first cast at the Coalbrookdale foundry in the 1940s, where they are still made by the Aga Rangemaster Group.
Answer: AGA cooker