Electrical command - and / or signalling unit, for mounting in a wall opening.

摘要

The ferrates have the formula: & br / m (fe, x) o4 br / in which m denotes two atoms na or k, or an atom of ca or ba, and x is an atom of which the cation of the electronic structure of a rare gas, said ferrates being isomorphic of ferrates of formula m fe o4, in which m has the same definition as c -. & br / use in particular for the treatment of water, by oxidation.