GB1437793A - - Google Patents

Info

Publication number
GB1437793A
GB1437793A GB3079573A GB3079573A GB1437793A GB 1437793 A GB1437793 A GB 1437793A GB 3079573 A GB3079573 A GB 3079573A GB 3079573 A GB3079573 A GB 3079573A GB 1437793 A GB1437793 A GB 1437793A
Authority
GB
United Kingdom
Prior art keywords
holes
push
threaded
keyboard
stops
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
GB3079573A
Other languages
English (en)
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 filed Critical
Priority to GB3079573A priority Critical patent/GB1437793A/en
Priority to DE19742421005 priority patent/DE2421005A1/de
Publication of GB1437793A publication Critical patent/GB1437793A/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)
  • Push-Button Switches (AREA)
  • Telephone Set Structure (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
GB3079573A 1973-06-28 1973-06-28 Expired GB1437793A (enrdf_load_stackoverflow)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB3079573A GB1437793A (enrdf_load_stackoverflow) 1973-06-28 1973-06-28
DE19742421005 DE2421005A1 (de) 1973-06-28 1974-04-30 Drucktastensperre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3079573A GB1437793A (enrdf_load_stackoverflow) 1973-06-28 1973-06-28

Publications (1)

Publication Number Publication Date
GB1437793A true GB1437793A (enrdf_load_stackoverflow) 1976-06-03

Family

ID=10313250

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3079573A Expired GB1437793A (enrdf_load_stackoverflow) 1973-06-28 1973-06-28

Country Status (2)

Country Link
DE (1) DE2421005A1 (enrdf_load_stackoverflow)
GB (1) GB1437793A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
DE2421005A1 (de) 1975-01-30

Similar Documents

Publication Publication Date Title
CA1002637A (en) Automatic exclusion circuit for a key telephone set
CA1003142A (en) Keyboard with key-operated switches for an electrical circuit
CA994486A (en) Switching apparatus for use in a paging system of a key telephone system
GB1437793A (enrdf_load_stackoverflow)
CA992228A (en) Key telephone line circuit
CA1017088A (en) Key selector switch for telephone sets
CA1005182A (en) Interlocking pushbutton keys for a key telephone set
GB571083A (en) Improvements in or relating to telephone subset assemblies
AU7344381A (en) Key for dialling with replaced handset
GB1127265A (en) Telephone system
GB1239698A (enrdf_load_stackoverflow)
GB810430A (en) Improvements in electrical or telephone jack key or lamp units and assemblies thereof
CA959568A (en) Cutover transition switching apparatus and method for telephone office equipment
GB1091362A (en) Improvements in or relating to electric control apparatus units and mounting arrangements therefor
CA1003585A (en) Line card circuit for a key telephone system
CA1031478A (en) Conference call circuit for use in a key telephone system
AU180561A (en) Wiring plate for telecommunications andmore especially telephone installations
CA997874A (en) Signal interrupter circuit for a key telephone system
AU490662B2 (en) Improvements in pushbutton calling circuits for telephone sets
IL53170A0 (en) Switching arrangements for telephone switchboards
GB1263029A (en) Mounting arrangement for electrical devices
GB697731A (en) Improvements in or relating to telephone instruments
JPS5413711A (en) Main-wire connection system of cordless attendant board
AU7177074A (en) Improvements in pushbutton calling circuits for telephone sets
FR2246132A1 (en) Co-ordination of telecommunications and electronic equip in offices - involves multiple interconnection switching and control system

Legal Events

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