Manual alarm telegraph; e.g., other than signal box type:
(under subclass 286.01) Subject matter wherein the system employs interruptions and/or polarity changes of direct current for the transmission of alarm signals that have been keyed.
(1) Note. This is the residual subclass for manual alarm telegraphs systems not elsewhere classified.
(2) Note. Manual alarm telegraphs are also called alarm telegraph systems.
(3) Note. The term "Telegraph system" should be distinguished from the subject matter of Class 178, Telegraphy, which subject matter permits signaling of a message of arbitrary content.
SEE OR SEARCH THIS CLASS, SUBCLASS:
287+, for this subject matter when the transmitter is of the signal box type.
500+, for condition responsive alarm devices. SEE OR SEARCH CLASS
178, Telegraphy,
2+, for Telegraph systems including information signal of arbitrary contents.
