The present invention relates to processes for preparing amine substituted benzofurans, and more particularly 4–2-methyl-1-pyrrolidinylethyl-1-benzofuran-5-yl)benzonitrile, and salts thereof. Therefore, a wavefront difference of the aspherical lens to be inspected with respect to the reference aspherical lens is made to be interference fringe information and formed on an image pickup plane of the interferometer CCD camera. As a result, the image recording carrier web is reliably decurled by a simple construction without being influenced by a transfer velocity or the like. The lock core defines the rest position for the lever handles at an angle slightly above horizontal. aligned at predetermined intervals along a length of the tube, and a core member 20 that holds the alignment of the frame members. Formed high-pressure gas is burned furiously with combustible gas in the gas chamber at next stage, and the remaining exhaust gas is transferred into next gas exchange section with very high-speed revolution occurring on exhaust gas and momentum transfer.