A method for fabricating a carbon nanotube film includes the following steps: providing a vacuum chamber having a carbon nanotube array therein; and pulling a carbon nanotube film out from the carbon nanotube array. The polyether segment can include monomeric units from an oxetane monomer having pendant fluorine groups that are linked to the oxetane via an ether group. The housing has groove portions which are different in acoustic impedance from their surroundings. 02,4nonane-bromide, processes for preparing it and its use for preparing a pharmaceutical composition, particularly for preparing a pharmaceutical composition with an anticholinergic activity. At this time, the luminance of the display unit 1 at the time of the picture upside-down inversion is changed to a higher luminance, thereby making it possible to enhance the visual recognizability from the facing side. Further, the battery may be sealed in a one step process.