Abstract: Pyridine derivatives useful for preventing or treating peptic ulcers, pharmaceutical preparations and methods of treating peptic ulcers are described.

Abstract: A rotor for miniature motors having an annular spark-quenching element for suppressing electrical sparks generated between commutator segments and brushes, in which the commutator segment is composed of a commutating portion coming into sliding contact with the brushes, and a terminal portion connected to a lead wire of a rotor winding; the terminal portion having an element-retaining portion on which the annular spark-quenching element is mounted; and the annular spark-quenching element being electrically connected to the element-retaining portion, as mounted thereon.

Abstract: A miniature motor having a rotor comprising a commutator having locating projections formed on the commutator reference surface coming in contact with a rotor core, and a rotor core having thereon locating key holes for engaging with the locating projections; the commutator being fitted to the rotor core by engaging the locating projections with the locating key holes until the commutator reference surface comes in contact with the rotor core; in which each of the locating projections has a temporary insertion portion at the tip thereof, whose cross-section is smaller than the cross-section of the locating key hole, and a full insertion portion for engaging with the locating key hole; the full insertion portion has such a length that the commutator tongue of the commutator is located at a position higher than the height of the rotor windings in a state where the temporary insertion portion is inserted into the locating key hole.