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 of BE568433ApublicationCriticalpatent/BE568433A/xx
H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
H04Q3/625—Arrangements in the private branch exchange
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04M—TELEPHONIC COMMUNICATION
H04M3/00—Automatic or semi-automatic exchanges
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
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Engineering & Computer Science
(AREA)
Signal Processing
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Physics & Mathematics
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Astronomy & Astrophysics
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General Physics & Mathematics
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Computer Networks & Wireless Communication
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Sub-Exchange Stations And Push- Button Telephones
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