An apparatus, for example for a pitch change mechanism, includes a cylinder having a magnetic portion defining an annular array of features extending parallel to the longitudinal axis of the cylinder, the cylinder rotating in use and able to translate longitudinally. or higher along a trough receiving the material has one or more cooling liquid flow vessels extending over but spaced from the outer surface of a trough inner wall to indirectly cause cooling of the inner wall. A transistor is formed between the first and second STI insulators. Qualified emergency response personnel can preregistered their phones and be assigned personal identification numbers to enable access to allocated network resources. Counter substrate CT is provided with recesses RS corresponding to the transparent electrode films 8 of circuit array substrate AR to make the thickness of liquid crystal layer LQ thicker at transparent electrode films 8 than at reflective electrode films 9.