A mask for a color cathode ray tube and a manufacturing method thereof are provided. Applications that need configuration variables can make a request to the properties server. The first network node receives, from a second network node, a request for information indicating a serving RAN node which serves a communications resource. The spring struts and the hinge struts are of such a configuration and arrangement that both the compressed condition of the bearing structure and also the expanded condition of the bearing structure is stabilized by a spring action emanating from the spring struts. The method comprises halogenation of 2,6-diaminopurine derivatives at the C-2 position in a specific combination of aprotic polar and nonpolar organic solvents to give the corresponding halogenated derivatives.