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Class Information
Number: 178/69.6
Name: Telegraphy > Systems > Call
Description: Means for signaling a remote operator, who, in response to such signaling connects the recorder.

Patents under this class:

Patent Number Title Of Patent Date Issued
4229621 Transmitting means for use in a high speed, low noise digital data communication system Oct. 21, 1980
4229623 Receiving means for use in a high speed, low noise digital data communication system Oct. 21, 1980
4229741 Two-way communications system and method of synchronizing Oct. 21, 1980

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