sentences:  Rybnik then grew as an important centre of coal mining and the seat of the surrounding county in the 19th century.Under Poland's communist rule in 1945–1989 the city was projected to grow as a main mining centre of southern Poland.The Rybnik area with its large coal reserves and power plants is an important economic region, and a notable center of music, home of the Szafrankowie Brothers State School of Music as well as a Philharmonic Orchestra.