A method of manufacturing a thermal print head includes a conductor layer formation step, a first measurement step, a conductor layer splitting step and a second measurement step. The system includes a wavelength tuner that provides information of a desired wavelength; a coupler for tapping a portion of the light from the tunable laser; and an apparatus for measuring the actual wavelength of the light. The positioning system unit determines the position of the user information retrieval device and the transmitter transmits the position coordinates to a remote computer over a wireless network. The present invention is useful in presenting a product to prospective customers at any location necessary. The node changes the mode in which the node operates when the node receives an indicator on a plurality of the independent communication links. The coating is superior in adhering properties to a substrate and is equipped with an adequate hardness.