Abstract: A liquid crystal display apparatus includes a liquid crystal panel for data display comprising a pair of oppositely disposed substrates and a liquid crystal disposed between the substrates, a sheet of substantially transparent protection plate disposed opposite to and with a prescribed gap from a display surface of the liquid crystal panel for protecting the liquid crystal panel, and a polarizer sheet for selectively transmitting light having a plane of polarization in a prescribed direction disposed on at least the display surface of the liquid crystal panel. The display apparatus further includes an anti-reflection film disposed on at least a front surface on an opposite side with respect to the liquid crystal panel of the protection plate among two surfaces of the protection plate and a surface of the polarizer sheet.

Abstract: A dosimeter comprising a support having provided thereon a radiation-sensitive layer which comprises (a) a polymer containing halogen atoms or a polymer containing acetic acid groups and (b) a pH-sensitive indicator dye. The dosimeter provides an easy determination of exposure dose by color change, even at high and low exposure doses.

Abstract: A smoke filter for removing injurious components from the smoke. Comprises a fiber matrix in conjunction with a water-swellable synthetic mica. The fiber matrix may be made of cellulose acetate, regenerated cellulose, or the like. The water-swellable synthetic mica is of the general formulaW.sub.1/3 to 1 (X,Y).sub.2.5 to 3 (Si.sub.4 O.sub.10)F.sub.2wherein W is Na or Li cation, and X and Y represent 6-coordinate ions, for example, Mg and Li. Suitable synthetic micas include Na-tetrasilicic mica, Na-taeniolite, Li-taeniolite, Na-hectorite, and Li-hectorite.

Abstract: An alicyclic amino compound of the general formula: ##SPC1##Wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each hydrogen or alkyl having 1 to 6 carbon atoms; X is each hydrogen, alkyl having 1 to 6 carbon atoms or aminomethyl; n is an integer of 1 or 2, and their production. The subject compound is useful as a cationic surfactant, complexing agent and intermediate.