Abstract: A rotating polygon mirror includes a polygon cylinder having a reflection mirror surface formed on at least one of the sides thereof, and mount portions formed on an upper surface and a lower surface thereof, which are to be held by mount members of a laser scan type optical system. At least one of the mount portions on the upper and lower surfaces has such a shape that, when two rotating polygon mirrors are stacked with their non-corresponding mount portions abutting each other, a reference surface formed in at least one of the mount portions of one rotating polygon mirror does not contact the mount portion of the other rotating polygon mirror.

Abstract: Novel aminotetralol compounds of the formula ##STR1## wherein Z.sup.1 and Z.sup.2 are hydrogen or an alkyl group and R.sup.1 is a substituted acyclic hydrocarbon group or a cyclic hydrocarbon group, and their pharmaceutically acceptable salts, have excellent pharmacological activities such as strong bronchodilating activity or .beta.-adrenergic blocking activity. They are useful as medicines, for example, for treatment of asthma or arrhythmia.

Abstract: Novel bicyclic compounds of the general formula: ##STR1## wherein Y stands for --O-- or a methylene group, Z stands for hydrogen or an alkyl group having 1 to 6 carbon atoms and R stands for hydrogen or an alkyl group having 1 to 6 carbon atoms are useful as medicines for treatment of asthma or arrhythmia.

Abstract: Novel aminotetralol compounds of the formula ##STR1## wherein R.sup.1 is hydrogen, acyl derived from carboxylic acid, or a hydrocarbon group which may be substituted; --OZ.sup.1 is hydroxyl which may be protected; Y is hydrogen, acyl, hydroxyl which may be protected, amino which may be substituted, nitro, cyano or halogen; and n is zero, 1 or 2 with a proviso that when Y is hydrogen or hydroxyl which may be protected, n is not zero, and their salts, have excellent pharmacological activities such as strong bronchodilating activity. They are useful as medicines, for example, for treatment of asthma.

Abstract: Novel aminotetralol compounds of the formula ##STR1## wherein Z.sup.1 and Z.sup.2 are hydrogen or an alkyl group and R.sup.1 is a substituted acyclic hydrocarbon group or a cyclic hydrocarbon group, and their pharmaceutically acceptable salts, have excellent pharmacological activities such as strong bronchodilating activity or .beta.-adrenergic blocking activity. They are useful as medicines, for example, for treatment of asthma or arrhythmia.