What is the fine-grained topic of the following text: In addition to historical fundamental analyses, the complete report available to purchase compares Mathios SA with three other clay and ceramic product manufacturers in Europe: Macofil SA of Romania (2017 sales of 28.27 million Romanian Leu [US$6.70 million] ), Koninklijke Porceleyne Fles NV of the Netherlands (5.43 million Euro [US$6.13 million] ), and Donskoy Zavod Radiodetaley Oao which is based in Russia (2.05 billion Russian Rubles [US$31.95 million] ). Only return the topic.
Comparison of Mathios SA with other European clay and ceramic product manufacturers