Priority date (The priority date 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 date listed.)
Publication date
Publication of BE756388ApublicationCriticalpatent/BE756388A/xx
H04M3/42—Systems providing special services or facilities to subscribers
H04M3/58—Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04Q—SELECTING
H04Q3/00—Selecting arrangements
H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages
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Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Computer Networks & Wireless Communication
(AREA)
Sub-Exchange Stations And Push- Button Telephones
(AREA)