GB1182569A - Improvements in or relating to Keyboard Dialling Arrangements - Google Patents

Improvements in or relating to Keyboard Dialling Arrangements

Info

Publication number
GB1182569A
GB1182569A GB2590668A GB2590668A GB1182569A GB 1182569 A GB1182569 A GB 1182569A GB 2590668 A GB2590668 A GB 2590668A GB 2590668 A GB2590668 A GB 2590668A GB 1182569 A GB1182569 A GB 1182569A
Authority
GB
United Kingdom
Prior art keywords
dialling
digit
key
common bar
circuit
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
GB2590668A
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of GB1182569A publication Critical patent/GB1182569A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/677—Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
GB2590668A 1967-05-31 1968-05-30 Improvements in or relating to Keyboard Dialling Arrangements Expired GB1182569A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1967S0110093 DE1293864B (de) 1967-05-31 1967-05-31 Waehltastatur mit Fernwahlsperre

Publications (1)

Publication Number Publication Date
GB1182569A true GB1182569A (en) 1970-02-25

Family

ID=7529973

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2590668A Expired GB1182569A (en) 1967-05-31 1968-05-30 Improvements in or relating to Keyboard Dialling Arrangements

Country Status (5)

Country Link
BE (1) BE715970A (https=)
DE (1) DE1293864B (https=)
GB (1) GB1182569A (https=)
NL (1) NL146354B (https=)
SE (1) SE328028B (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358640A (en) 1980-11-25 1982-11-09 Murray Leonard Q Telephone security device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2285765A1 (fr) * 1974-09-17 1976-04-16 Picart Lebas Telephones Dispositif de restriction de service pour appareil telephonique a clavier ou a cadran
DE2648679C2 (de) * 1976-10-27 1978-11-16 Elmeg-Elektro-Mechanik Gmbh, 3150 Peine Wahltastatur mit Erstziffernsperrung
DE2755699C2 (de) * 1977-12-14 1984-09-27 Friedrich Merk-Telefonbau GmbH, 8000 München Mit einem Gebührenzähler kombiniertes Sperrschloß für Fernmelde-, insbesondere Fernsprechgeräte

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358640A (en) 1980-11-25 1982-11-09 Murray Leonard Q Telephone security device

Also Published As

Publication number Publication date
NL146354B (nl) 1975-06-16
BE715970A (https=) 1968-12-02
DE1293864B (de) 1969-04-30
NL6806814A (https=) 1968-12-02
SE328028B (https=) 1970-09-07

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees