Abstract: The present invention provides a mounting hinge mounted on a covering shelf or cargo screen for vehicles, capable of maintaining an assembled state in which a hinge protrusion, which is elastically supported in a main body, is always in contact with a guide groove by configuring one side of the hinge protrusion to protrude out of the main body and configuring a protruding portion to be forcibly fitted into a guide groove formed in a trunk to assemble the covering shelf or cargo screen, thereby preventing detachment and separation of the covering shelf or cargo screen so that the covering shelf or cargo screen is safely and conveniently used.

Abstract: A method and device of measuring a water level of a frequency analysis type is disclosed. The device is consisted of a pipe type of which immersed length is in a proportion to the water level and which is installed in a container having a fluid, a signal detecting device which has an impact apparatus to provide a source signal periodically or continuously and a impact detecting sensor(s) which gets a response signal of the pipe by the impact apparatus, and a signal analyzer which processes the signal from the impact detecting sensor. The method comprises steps of: generating a source signal to the pipe by the impact apparatus; detecting the response signal of the pipe according the water level by the impact detecting sensor; analyzing the response signal to the frequency response spectra by the signal analyzer; and measuring the water level by comparing to the predetermined frequencies which was obtained by the signal analyzer.