An apparatus for providing a remote display of the operating condition of a water treatment system having an electronic control utilizing a voice grade telephone system. A tone generator is associated with electronic control to generate tones which are transmitted through the telephone ...http://www.google.fr/patents/US5774529?utm_source=gb-gplus-shareBrevet US5774529 - Apparatus to provide a remote display of the operating condition of a water treatment system
Apparatus to provide a remote display of the operating condition of a water ...
