Given the question: Information:  - Gird (also can be known as Gopasetra in ancient times, or Gwalior region later) is a region of Madhya Pradesh state in central India. It includes the districts of Bhind, Gwalior, Morena, Sheopur, and Shivpuri. Gwalior is the largest city in the region, and its historic center.  - The Dushkin S - 155 was a liquid - fueled rocket motor designed by Leonid Dushkin specifically for use in the Mikoyan - Gurevich Ye - 50 and Ye - 50A ( aka MiG - 23U ) experimental - developmental aircraft in the 1950s . It delivered 37.3 kN ( 8380 lbf ) and ran on a mix of TG - 02 hypergolic kerosene and AK - 20 oxidizer ( nitric acid ) . The fuel pumps were powered with grade T hydrogen peroxide .  - Leonid Stepanovich Dushkin (  ) (August 15, 1910 in the Spirove settlement of the Tver region  April 4, 1990), was a major pioneer of Soviet rocket engine technology. He graduated from Moscow State University with a degree in mathematics and mechanics. In October 1932, he joined Fridrikh Tsander's brigade of GIRD, the Moscow rocket research group. He assisted in the creation of their first rocket engine OR-2, and after Tsander's death, he oversaw the creation of engine "10" which powered the first Soviet liquid-fuel rocket, GIRD-X.    What entity does 'dushkin s-155' has the relation 'subclass of' with?
The answer is:
rocket engine