Question: What type of  specialist racing cars were developed by Porsche in Germany from 1933 to 1939?
Context: Rotor Racing Cars is a Scottish based specialist manufacturer of single-seater racing cars, sports racing cars and road-going low volume sports cars.  The Rotor JT7C competed in the BRSCC Sports 2000 championship.  A road-going version of the original Road Going Rotor JT7 also exists.  Rotor racing cars has historically been involved with the preparation of racing cars and among other championships has competed in the Scottish Formula Ford championship, Scottish Road Saloons championship and The British GT Championship. The Auto Union Grand Prix racing cars types A to D were developed and built by a specialist racing department of Auto Union's Horch works in Zwickau, Germany, between 1933 and 1939. Chevron Cars Ltd. is an English manufacturer of racing cars, founded by Derek Bennett in 1965.  Following Bennett's death in 1978, the firm has remained active in various guises.  The original company's designs and name continue to be used to build replacement parts and continuation models of earlier Chevrons.  In 2000, Chevron Racing Cars Ltd., founded by Vin Malkie acquired the trade mark Chevron Racing Cars Ltd and in addition to the company's other activities has designed and built new grand tourer racing cars under the Chevron name, as well as other continuation models of earlier Chevrons. Ronart Cars is a British sports car manufacturer and constructor of unique and bespoke sports racing cars.  The company was founded in 1984 by Rona and Arthur Wolstenholme, based in Peterborough.  The company design and manufacture sports and racing cars for both road legal and track day use with unique designs from open wheel racing cars to modern day sports cars. The Porsche 356 is an iconic sports car which was first produced by Austrian company Porsche Konstruktionen GesmbH (1948–1949), and then by German company Dr. Ing.  h. c. F. Porsche GmbH (1950–1965).  It was Porsche's first production automobile.  Earlier cars designed by the Austrian company include Cisitalia Grand Prix race car, the Volkswagen Beetle, and Auto Union Grand Prix cars. The 2011 Deutsche Tourenwagen Masters season is a multi-event motor racing series largely based in Germany for highly modified touring car racing cars and is one of the most popular sedan car based motor racing series in the world.  The series features professional motor racing teams and drivers is heavily supported by car manufacturers Audi and Mercedes-Benz.  Each race features 18 V8 powered racing cars built according to the technical regulations of the Deutsche Tourenwagen Masters.  It will be the twelfth season of Deutsche Tourenwagen Masters since the series' resumption in 2000.  The 2011 season will be the first season that cars will not run on Dunlop tyres, instead running on Hankook tyres in the first year of a three-year control-tyre deal.  It was the final season running the 4-door saloon style spec cars, which has been the series' sole car style requirements since 2004.  It was also the final season that all DTM cars running with the manual gearbox shifters before all DTM cars switched to sequential semi-automatic gearbox paddle shifters at the following season. The 1955 South Pacific Championship for racing cars was a motor race staged at the Gnoo Blas Motor Racing Circuit at Orange in New South Wales, Australia on 31 January 1955.  The race, which was a Formula Libre event open to racing cars and stripped sports cars, was contested as a scratch race which also incorporated a handicap award.  It was held over 27 laps of the 3¾ mile circuit for a total distance of 100 miles.  The race, which was the first South Pacific Championship for racing cars, was won by Englishman Peter Whitehead driving a 3 litre Ferrari. The Australian Formula Junior Championship was a short-lived motor racing championship held in Australia for drivers of open-wheel racing cars conforming to Formula Junior regulations.  The championship was sanctioned by the Australian governing body CAMS and held for just two years.  While Formula Junior cars began appearing in Australia as early as 1960, the category did not get a national championship until 1962.  Both championships held were single event championships and were held in 1962 and 1963.  The main distinguishing feature of Formula Junior in this period was its engine capacity, which was set at 1100 cubic centimetres, with engines being sourced from a regularly available production road car with the Ford engine available in the Ford Anglia amongst the most prolific.  For 1964 Formula Junior was combined into the newly established Australian Formula 2 which also featured 1000 cc engined cars with specialist racing engines.  This championship was the first major title in Australia to be held to an international set of regulations. The Porsche 919 Hybrid is a sports-prototype racing car constructed by the German car manufacturer Porsche for use in the Le Mans Prototype 1-Hybrid (LMP1-H) category of the FIA World Endurance Championship for factory-supported hybrid-powered cars.  It is the first sports-prototype built by Porsche since the RS Spyder, the first sports-prototype built by Porsche to compete in a top category of sportscar racing since the Porsche 911 GT1-98 and Porsche LMP1-98 and the first sports-prototype to be raced by Porsche as a racing team since the Porsche 911 GT1-98 and Porsche LMP1-98.  It uses a 2.0 L four-cylinder turbocharged engine with a battery-based hybrid system.  The car made its competitive debut at the 2014 6 Hours of Silverstone, the opening round of the 2014 season.  The 919 Hybrid project is scheduled to be discontinued at the end of the 2017 season to allow Porsche to focus on entering Formula E. Nota Sports and Racing Cars is an automobile manufacturer in Australia.  The company was founded by Guy Buckingham in 1952.  He was an aircraft engineer and used his expertise to build triangulated spaceframed sportscars.  Possibly Australia's first space-framed cars.  In 1958 the company built a series of all-enveloping aluminium streamlined sports cars.  First called "Streamliners", and later called "Mazengarbs".  Up to 1960 eleven of those were made.  In the late 1950s the company produced Formula Junior cars in both front and midengined formats.  Nota also made a series of specialist monoposto racing cars for the track and hill climbing events.  In 1963 the company made a series of Mini powered sports cars.  In 1964 they started production of the Nota Sapphire an alloy bodied sports and coupe designs with Ford Fiat and Coventry Climax engines.  In 1965 Nota started producing Formula Vee cars for Warrick Farm race track making 34 in the first year.  In the 1960s the company formulised their "Sportsman", a Lotus 7 look alike, which they still build today and are now building in a midengined version for the modern day transverse engines which the major car manufacturers produce.  In 1968 came the Nota Fang Chris Buckinghams first real design, a midengined sports car using a Cooper S engine power plant behind the driver but in front of the rear wheels, their most successful model with over 100 being made.  Later the Fang was equipped with Lancia engines, then Toyota engines, finally being fitted with Toyota's V6 Quad cam supercharged engines with over 400BHP.  In 1973 Nota started with their Marauder range of cars using the same mechanicals as the Nota Fang.  At the same time they were making the Nota Levanti front engine twin cam coupe.  In 1975 the supply of Leyland 1275 GT engines started to run out so Nota contacted FIAT and both Marauders and Fangs were made with the 2-litre twin cam FIAT/Lancia engine.
Answer: Auto Union Grand Prix cars