The main aim of the invention is to provide a polymerizable compound that is excellent in the stability of a liquid crystal phase, a polymerizable liquid crystal composition, and an anisotropic polymer in which the optical anisotropy can be adjusted and a uniform orientation is excellent. The identification device 10 is coupled to a user station 30. In another aspect, the picture information includes an encoding mode for the macroblocks in the first format. Analysis of this combined data allows identification of problems and generation of advisories. The system may be operable to be set-up and to operate in a substantially autonomous manner. Such a highly tough oil well steel pipe can be produced by rolling the base material, quenching the rolling product from the austenite region and tempering the same so that the relationship between the content of Mo Mo in the carbides precipitated at austenite grain boundaries and the austenite grain size can be defined by the formula given below.