HK97387A - Improvements in telephone installations - Google Patents

Improvements in telephone installations

Info

Publication number
HK97387A
HK97387A HK97387A HK97387A HK97387A HK 97387 A HK97387 A HK 97387A HK 97387 A HK97387 A HK 97387A HK 97387 A HK97387 A HK 97387A HK 97387 A HK97387 A HK 97387A
Authority
HK
Hong Kong
Prior art keywords
telephone installations
installations
telephone
Prior art date
Application number
HK97387A
Other languages
English (en)
Inventor
Horst Brandstatter
Original Assignee
Brandstaetter Geobra
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 Brandstaetter Geobra filed Critical Brandstaetter Geobra
Publication of HK97387A publication Critical patent/HK97387A/xx

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)
HK97387A 1983-11-15 1987-12-24 Improvements in telephone installations HK97387A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
HK97387A true HK97387A (en) 1987-12-31

Family

ID=6214353

Family Applications (1)

Application Number Title Priority Date Filing Date
HK97387A HK97387A (en) 1983-11-15 1987-12-24 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
GB2149998A (en) 1985-06-19
DE3341251C2 (enrdf_load_stackoverflow) 1987-12-10
GB8417282D0 (en) 1984-08-08
GB2149998B (en) 1987-03-18
DE3341251A1 (de) 1985-05-30

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