GB308811A - Improvements in intercommunication telephone systems - Google Patents

Improvements in intercommunication telephone systems

Info

Publication number
GB308811A
GB308811A GB9882/29A GB988229A GB308811A GB 308811 A GB308811 A GB 308811A GB 9882/29 A GB9882/29 A GB 9882/29A GB 988229 A GB988229 A GB 988229A GB 308811 A GB308811 A GB 308811A
Authority
GB
United Kingdom
Prior art keywords
indicator
parties
party
bell
receiver
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB9882/29A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB308811A publication Critical patent/GB308811A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Telephonic Communication Services (AREA)
  • Mobile Radio Communication Systems (AREA)
GB9882/29A 1928-03-31 1929-03-27 Improvements in intercommunication telephone systems Expired GB308811A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE308811X 1928-03-31

Publications (1)

Publication Number Publication Date
GB308811A true GB308811A (en) 1930-07-28

Family

ID=20307586

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9882/29A Expired GB308811A (en) 1928-03-31 1929-03-27 Improvements in intercommunication telephone systems

Country Status (4)

Country Link
US (1) US1789142A (enrdf_load_stackoverflow)
BE (1) BE359444A (enrdf_load_stackoverflow)
FR (1) FR672218A (enrdf_load_stackoverflow)
GB (1) GB308811A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2646473A (en) * 1950-04-25 1953-07-21 Talk O Products Inc Manually operated selecting and controlling switch apparatus

Also Published As

Publication number Publication date
BE359444A (enrdf_load_stackoverflow)
FR672218A (fr) 1929-12-24
US1789142A (en) 1931-01-13

Similar Documents

Publication Publication Date Title
GB308811A (en) Improvements in intercommunication telephone systems
US2764632A (en) Intercommunication telephone systems
GB522457A (en) Improvements in or relating to systems of simultaneous telephony on a number of lines
US1802675A (en) Intercommunicating telephone and signal system
US2283646A (en) Telephone apparatus and circuit therefor
US2871303A (en) Telephone intercommunication system having means for interconnecting any two stations
US2249156A (en) Telephone system
GB890860A (en) Signalling system for automatic telephone exchanges
US1251536A (en) Telephone system.
US1606794A (en) Telephone system
US1196761A (en) Telephone system.
US967113A (en) Combined telephone and alarm or kindred service system.
US2425187A (en) Intercommunicating system
US904441A (en) Combined telephone-exchange and alarm system.
US957869A (en) Intercommunicating telephone system.
US2623124A (en) Intercommunication telephone system
US626624A (en) Circuit and apparatus for bridging telephones
US2238070A (en) Broadcast switching system
US1870471A (en) Telephone system
US978709A (en) Combined telephone and alarm or kindred service system.
US2866854A (en) Tone applier circuit
US243165A (en) scribner
US2254723A (en) Subscriber line circuit
US931307A (en) Private-branch intercommunicating telephone system.
GB677894A (en) Improvements in or relating to intercommunication telephone systems