Question: R1155 was a receiver used mainly in larger aircraft like the heavy bomber used during what war?
Context: The Gotha G.III was a heavy bomber used by the "Luftstreitkräfte" (Imperial German Air Service) during World War I.  It succeeded the G.II in production and differed primarily in the choice of powerplant.  The eight-cylinder Mercedes D.IV, which had proven highly susceptible to crankshaft failure, was replaced by the new six-cylinder 190 kW (260 hp) Mercedes D.IVa engine.  The G.III also had a strengthened fuselage with an extra 7.92 mm (.312 in) machine gun firing through a ventral trapdoor.  The G.III was also the first bomber to have a tail gun with a potential 360 degree arc of fire. "Kampfgeschwader" 40 (KG 40) was a Luftwaffe medium and heavy bomber wing of World War II, and the primary maritime patrol unit of any size within the World War II Luftwaffe.  It is best remembered as the unit operating a majority of the four-engine Focke-Wulf Fw 200 "Condor" maritime patrol bombers.  The unit suffered from the poor serviceability and low production rates of the Fw 200 bombers, and from repeated diversion of its long-haul capability aircraft to undertake transport duties in various theatres, especially for the airlift operations to supply encircled forces in the Battle of Stalingrad.  Later in the war, KG 40 became one of several Luftwaffe bomber wings to use the Heinkel He 177A heavy bomber. The Bomber Mafia were a close-knit group of American military men who believed that long-range heavy bomber aircraft in large numbers were able to win a war.  The derogatory term 'Bomber Mafia' was used before and after World War II by those in the military who did not share their belief, and who were frustrated by the insistence of the men that the heavy bomber should take a primary position in planning and funding. The Avro Lancaster is a British four-engine heavy bomber used by the Royal Air Force and other Allied countries during World War II.  Of the 7,377 aircraft built, only 17 remain in complete form today, two of which are airworthy.  Within the seventeen surviving planes, ten are Canadian-built, and eight now reside in Canada. The R1155 was a British communications receiver, commonly used in aircraft along with its associated T1154 transmitter.  It was used extensively by the Royal Air Force during World War II, mainly in larger aircraft such as the Avro Lancaster, Handley Page Halifax, Vickers Wellington and Short Sunderland.  Some were also used in vehicles and air-sea rescue launches. The Gotha G.V was a heavy bomber used by the "Luftstreitkräfte" (Imperial German Air Service) during World War I.  Designed for long-range service, the Gotha G.V was used principally as a night bomber. Tupolev TB-6 (internal designation ANT-26; Russian: Туполев ТБ-6/АНТ-26 ) was a proposal for a 1930s heavy bomber that did not advance beyond blueprints.  Inspired by the success of the ANT-20/PS-124, Tupolev began work in 1929 on an even larger aircraft, powered by 12 engines and with a takeoff weight of 70000 kg .  By the mid-1930s, the trend in military aviation shifted towards smaller and faster aircraft and the TB-6 was cancelled.  The ANT-28 was a proposed cargo version. The Avro Lancaster is a British four-engined Second World War heavy bomber.  It was designed and manufactured by Avro as a contemporary of the Handley Page Halifax, both bombers having been developed to the same specification, as well as the Short Stirling, all three aircraft being four-engined heavy bombers adopted by the Royal Air Force (RAF) during the same wartime era. The Tupolev TB-3 (Russian: Тяжёлый Бомбардировщик , Tyazholy Bombardirovschik, Heavy Bomber, civilian designation ANT-6) was a heavy bomber aircraft which was deployed by the Soviet Air Force in the 1930s and during World War II.  It was the world's first cantilever wing four-engine heavy bomber.  Despite obsolescence and being officially withdrawn from service in 1939, the TB-3 performed bomber and transport duties throughout much of World War II.  The TB-3 also saw combat as a Zveno project fighter mothership and as a light tank transport. The Dornier Do 217 was a bomber used by the German "Luftwaffe" during World War II as a more powerful version of the Dornier Do 17, known as the "Fliegender Bleistift" (German: "flying pencil").  Designed in 1937 and 1938 as a heavy bomber but not meant to be capable of the longer-range missions envisioned for the larger Heinkel He 177, the Do 217's design was refined during 1939 and production began in late 1940.  It entered service in early 1941 and by the beginning of 1942 was available in significant numbers.
Answer: Second World War