PL142351B1 - Apparatus for limiting possibilities of dialling in telephone set - Google Patents

Apparatus for limiting possibilities of dialling in telephone set Download PDF

Info

Publication number
PL142351B1
PL142351B1 PL24659984A PL24659984A PL142351B1 PL 142351 B1 PL142351 B1 PL 142351B1 PL 24659984 A PL24659984 A PL 24659984A PL 24659984 A PL24659984 A PL 24659984A PL 142351 B1 PL142351 B1 PL 142351B1
Authority
PL
Poland
Prior art keywords
contact
electromagnetically controlled
controlled relay
permanent magnet
switching
Prior art date
Application number
PL24659984A
Other languages
English (en)
Polish (pl)
Other versions
PL246599A1 (en
Inventor
Kiril N Popov
Original Assignee
Sofijska Telegrafna I Telefonn
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 Sofijska Telegrafna I Telefonn filed Critical Sofijska Telegrafna I Telefonn
Publication of PL246599A1 publication Critical patent/PL246599A1/xx
Publication of PL142351B1 publication Critical patent/PL142351B1/pl

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)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Telephonic Communication Services (AREA)
  • Telephone Set Structure (AREA)
PL24659984A 1983-03-14 1984-03-09 Apparatus for limiting possibilities of dialling in telephone set PL142351B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BG6010583A BG37516A1 (en) 1983-03-14 1983-03-14 Device for limiting telephone dial selection

Publications (2)

Publication Number Publication Date
PL246599A1 PL246599A1 (en) 1984-10-22
PL142351B1 true PL142351B1 (en) 1987-10-31

Family

ID=3911892

Family Applications (1)

Application Number Title Priority Date Filing Date
PL24659984A PL142351B1 (en) 1983-03-14 1984-03-09 Apparatus for limiting possibilities of dialling in telephone set

Country Status (7)

Country Link
BG (1) BG37516A1 (ro)
CS (1) CS256918B1 (ro)
DD (1) DD252110A3 (ro)
DE (1) DE3407085A1 (ro)
HU (1) HU188613B (ro)
PL (1) PL142351B1 (ro)
RO (1) RO89332A (ro)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1268215B (de) * 1965-11-26 1968-05-16 Christos Stathacopoulos Vorrichtung an einem Fernsprechapparat zum Sperren des Apparates fuer Selbstwaehlferngespraeche
DE2341246A1 (de) * 1973-08-16 1975-02-20 Hagenuk Neufeldt Kuhnke Gmbh Elektronische sperreinrichtung fuer nummernschalterwahl zur verhinderung der wahl unerwuenschter waehlziffern
SE7411340L (ro) * 1974-01-19 1975-07-21 Masayuki Nagakura

Also Published As

Publication number Publication date
CS256918B1 (en) 1988-04-15
DD252110A3 (de) 1987-12-09
BG37516A1 (en) 1985-06-14
PL246599A1 (en) 1984-10-22
HU188613B (en) 1986-04-28
RO89332A (ro) 1986-07-30
DE3407085A1 (de) 1984-09-20
HUT35888A (en) 1985-07-29

Similar Documents

Publication Publication Date Title
US3014097A (en) Dial controlled intercommunication systems
PL142351B1 (en) Apparatus for limiting possibilities of dialling in telephone set
US3637947A (en) Call forwarding arrangement for telephone answering service systems
GB661118A (en) Improvements in or relating to automatic telephone systems
GB698848A (en) Improvements in or relating to private automatic branch telephone exchanges
US2020816A (en) Automatic telephone system
GB680608A (en) Toll switching telephone system
GB300497A (en) Improvements in or relating to telephone systems
US2815404A (en) Connection for automatic ring signal
US2310481A (en) Two-way trunk circuit
US3836723A (en) Answering system for pbxs
US2890282A (en) Automatic telephone system
US3415953A (en) Calling-party identification system for party-line telephone exchanges
US1632051A (en) Telephone system
US2807669A (en) Automatic telephone system
GB666500A (en) Automatic exchange systems
US1268221A (en) Automatic telephone-exchange system.
US1601061A (en) Automatic telephone-exchange system
US1337711A (en) Telephone-exchange system
US1952870A (en) Telephone system
PL41799B1 (ro)
GB190326848A (en) Telephone Systems
GB202968A (ro)
Mishra The Telephone Exchange—Line Circuits
GB393583A (en) Improvements in or relating to telephone systems