BE802572A - TELEPHONE IMPROVEMENTS - Google Patents

TELEPHONE IMPROVEMENTS

Info

Publication number
BE802572A
BE802572A BE133672A BE133672A BE802572A BE 802572 A BE802572 A BE 802572A BE 133672 A BE133672 A BE 133672A BE 133672 A BE133672 A BE 133672A BE 802572 A BE802572 A BE 802572A
Authority
BE
Belgium
Prior art keywords
telephone
telephone improvements
Prior art date
Application number
BE133672A
Other languages
French (fr)
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Publication of BE802572A publication Critical patent/BE802572A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/066—Telephone sets adapted for data transmision

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
BE133672A 1972-07-21 1973-07-19 TELEPHONE IMPROVEMENTS BE802572A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3420172A GB1392747A (en) 1972-07-21 1972-07-21 Data transmission telephones

Publications (1)

Publication Number Publication Date
BE802572A true BE802572A (en) 1973-11-16

Family

ID=10362646

Family Applications (1)

Application Number Title Priority Date Filing Date
BE133672A BE802572A (en) 1972-07-21 1973-07-19 TELEPHONE IMPROVEMENTS

Country Status (7)

Country Link
AU (1) AU5791273A (en)
BE (1) BE802572A (en)
DE (1) DE2337119C3 (en)
FR (1) FR2194093B1 (en)
GB (1) GB1392747A (en)
NL (1) NL7309979A (en)
ZA (1) ZA734626B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2208057A (en) * 1987-07-27 1989-02-15 Barron Mccann Limited Telephone interface device

Also Published As

Publication number Publication date
DE2337119C3 (en) 1975-06-05
AU5791273A (en) 1975-01-16
DE2337119B2 (en) 1974-10-24
FR2194093B1 (en) 1977-02-18
NL7309979A (en) 1974-01-23
FR2194093A1 (en) 1974-02-22
GB1392747A (en) 1975-04-30
DE2337119A1 (en) 1974-02-07
ZA734626B (en) 1974-06-26

Similar Documents

Publication Publication Date Title
BE797074A (en) SPEAKING TELEPHONE SET
SE377990C (en) SPEAKER TELEPHONE
BE801282A (en) TELEPHONE HEADSET
IT987335B (en) TELEPHONE SELECTION PROVISION
IT956327B (en) BUILT-IN TELEPHONE CABLE ENHANCED
IT1003592B (en) MICROPHONE
CA979551A (en) Telephone tone ringer
BE806010A (en) IMPROVEMENTS TO TELEPHONE SYSTEMS
NL7500501A (en) TELEPHONE DIALING SYSTEM.
NL7415585A (en) TELEPHONE SET.
SE382293B (en) TELEPHONE INSTALLATION.
BR7403020D0 (en) TELEPHONE
AT315251B (en) Telephone handset
NL169809C (en) SPEAKING TELEPHONE.
BE802572A (en) TELEPHONE IMPROVEMENTS
BR7108310D0 (en) PHONE HANDSET PERFORMANCE
IT1019932B (en) TELEPHONE
AT327299B (en) TELEPHONE HANDSET
OA05195A (en) Telephone trunk.
AT325117B (en) HANDSET FOR TELEPHONE SETS
SE386040B (en) TELECOMMUNICATORS FOR PHONE DEVICES
AT345898B (en) TELEPHONE
NL7506454A (en) TELEPHONE CONFERENCE SWITCH.
CH535518A (en) Telephone handset
BR7207916D0 (en) TELEPHONE