Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
Vorrichtung zum elektrischen Fernwaehlen eines beliebigen von mehreren Ortsstrom-kreisen auf der Empfangstelle von zur Zeichengabe dienenden elektrischen Anlagen