Abstract: A fluid flow engine (1), in particular a turbo engine, has at least one guide vane row (5) with a plurality of guide vanes (6) and at least one rotor blade row (7) with a plurality of rotor blades (8). One guide vane row (5) and one rotor blade row (7) that follows the former directly downstream with respect to a working gas flow (11), together form a stage (10) of the fluid flow engine (1).

Abstract: A fluid flow engine (1), in particular a turbo engine, has at least one guide vane row (5) with a plurality of guide vanes (6) and at least one rotor blade row (7) with a plurality of rotor blades (8). One guide vane row (5) and one rotor blade row (7) that follows the former directly downstream with respect to a working gas flow (11), together form a stage (10) of the fluid flow engine (1).

Abstract: Water-soluble azo dye which, in the form of the free acid, has the formula ##STR1## WHEREIN A represents lower alkyl, hydroxy lower alkyl or phenyl and R represents hydrogen, lower alkyl or hydroxy lower alkyl and A, when phenyl, and ring B is unsubstituted or substituted by nitro, alkyl or alkoxy, m has a value of 0 or 1 and E represents a residue selected from: ##STR2## wherein R.sup.5 represents hydrogen, lower alkyl, hydroxy lower alkyl or benzyl, R.sup.6 represents lower alkyl or hydroxy lower alkyl and R.sup.7 and R.sup.8 each independently represent hydrogen, lower alkyl, lower alkoxy or acetylamino; and ##STR3## WHEREIN R.sup.9 represents lower alkyl, hydroxy lower alkyl, sulphato lower alkyl, phenyl or phenyl substituted by lower alkyl, lower alkoxy or hydroxy and p has a value of 0 or 1 with the proviso that there are no more than two sulpho groups in said dye. The dye is useful to color natural and synthetic polyamide textile materials.