The present invention relates to a process for the preparation of a compound of formula wherein R represents hydrogen, C1-10alkyl, haloC1-10alkyl or aryl; which are useful intermediates in the preparation of morpholine derivatives of formula. The TSN acquires a merchant identifier and transaction amount from a customer mobile station. A laser mounted on the body emits a laser beam, directed away from the body, which has a geometrical central beam and a wavelength in the visible range. In such a way, the present invention is adapted to solve the difficulties of the underfill void bulb and the overflowing contamination at the same time. Two pivot rods extend outwardly from opposite ends of the crank holder, and are rotatably received in two corresponding slots defined in two front posts.