GB2149998B - Improvements in telephone installations - Google Patents

Improvements in telephone installations

Info

Publication number
GB2149998B
GB2149998B GB08417282A GB8417282A GB2149998B GB 2149998 B GB2149998 B GB 2149998B GB 08417282 A GB08417282 A GB 08417282A GB 8417282 A GB8417282 A GB 8417282A GB 2149998 B GB2149998 B GB 2149998B
Authority
GB
United Kingdom
Prior art keywords
telephone installations
installations
telephone
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
GB08417282A
Other languages
English (en)
Other versions
GB8417282D0 (en
GB2149998A (en
Inventor
Horst Brandstatter
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.)
Geobra Brandstaetter GmbH and Co KG
Original Assignee
Geobra Brandstaetter GmbH and Co KG
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 Geobra Brandstaetter GmbH and Co KG filed Critical Geobra Brandstaetter GmbH and Co KG
Publication of GB8417282D0 publication Critical patent/GB8417282D0/en
Publication of GB2149998A publication Critical patent/GB2149998A/en
Application granted granted Critical
Publication of GB2149998B publication Critical patent/GB2149998B/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
GB08417282A 1983-11-15 1984-07-06 Improvements in telephone installations Expired GB2149998B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833341251 DE3341251A1 (de) 1983-11-15 1983-11-15 Telefonanlage

Publications (3)

Publication Number Publication Date
GB8417282D0 GB8417282D0 (en) 1984-08-08
GB2149998A GB2149998A (en) 1985-06-19
GB2149998B true GB2149998B (en) 1987-03-18

Family

ID=6214353

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08417282A Expired GB2149998B (en) 1983-11-15 1984-07-06 Improvements in telephone installations

Country Status (3)

Country Link
DE (1) DE3341251A1 (enrdf_load_stackoverflow)
GB (1) GB2149998B (enrdf_load_stackoverflow)
HK (1) HK97387A (enrdf_load_stackoverflow)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1406586A (fr) * 1964-06-09 1965-07-23 Electronique & Automatisme Sa Dispositif téléphonique à sécurité dite intrinsèque
DE2142858C3 (de) * 1971-08-26 1974-01-10 Siemens Ag, 1000 Berlin U. 8000 Muenchen Schaltungsanordnung zur Erzeugung eines akustischen Rufsignals für Endstellen in Fernmelde-, insbesondere Fernsprechanlagen mittels eines Piezowandlers

Also Published As

Publication number Publication date
DE3341251C2 (enrdf_load_stackoverflow) 1987-12-10
GB8417282D0 (en) 1984-08-08
GB2149998A (en) 1985-06-19
DE3341251A1 (de) 1985-05-30
HK97387A (en) 1987-12-31

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920706