A conventional undercoating method in repair painting on a damaged vehicle, which includes many working processes, possesses drawbacks of being low in working efficiency and making a finally repaired area exceedingly larger than an initial damaged area. A process for polishing a glass substrate, comprising a step of measuring the surface profile of a mechanically polished glass substrate to identify the width of waviness present in the glass substrate, and a step of applying dry etching using a beam having a beam size in FWHM value of at most the above size of waviness, to polish the surface of the glass substrate. The antenna system comprises a ground plane, a first antenna element on a first side of the ground plane, and a second antenna element on a second side of the ground plane opposite first antenna element. The output signal is composed from a first number of first subsignals each having a first pulse width and a second number of second subsignals each having a second pulse width shorter than the first pulse width. The text may be automatically received as input from a voice-to-text converter as voice-to-text conversion producing the text is occurring.