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NL252052A - - Google Patents

Info

Publication number
NL252052A
NL252052A NL252052DA NL252052A NL 252052 A NL252052 A NL 252052A NL 252052D A NL252052D A NL 252052DA NL 252052 A NL252052 A NL 252052A
Authority
NL
Netherlands
Application number
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 NL252052A publication Critical patent/NL252052A/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Mobile Radio Communication Systems (AREA)
NL252052D 1959-05-28 NL252052A (zh)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1823659A GB925514A (en) 1959-05-28 1959-05-28 Improvements relating to telephone system substation circuits and to tone current generating oscillations suitable for use in such circuits

Publications (1)

Publication Number Publication Date
NL252052A true NL252052A (zh)

Family

ID=10108997

Family Applications (1)

Application Number Title Priority Date Filing Date
NL252052D NL252052A (zh) 1959-05-28

Country Status (3)

Country Link
DE (1) DE1142637B (zh)
GB (1) GB925514A (zh)
NL (1) NL252052A (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1059606A (en) * 1964-08-25 1967-02-22 Sits Soc It Telecom Siemens A ringer
CN113483882B (zh) * 2021-06-29 2023-03-14 重庆长安新能源汽车科技有限公司 一种电控发声装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE563265A (zh) * 1956-06-22

Also Published As

Publication number Publication date
DE1142637B (de) 1963-01-24
GB925514A (en) 1963-05-08

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