JPS539803B2 - - Google Patents

Info

Publication number
JPS539803B2
JPS539803B2 JP1251073A JP1251073A JPS539803B2 JP S539803 B2 JPS539803 B2 JP S539803B2 JP 1251073 A JP1251073 A JP 1251073A JP 1251073 A JP1251073 A JP 1251073A JP S539803 B2 JPS539803 B2 JP S539803B2
Authority
JP
Japan
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
JP1251073A
Other versions
JPS4996604A (ja
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 JP1251073A priority Critical patent/JPS539803B2/ja
Priority to US348313A priority patent/US3860763A/en
Priority to CA186,712A priority patent/CA1002637A/en
Publication of JPS4996604A publication Critical patent/JPS4996604A/ja
Publication of JPS539803B2 publication Critical patent/JPS539803B2/ja
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
JP1251073A 1973-01-13 1973-01-13 Expired JPS539803B2 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP1251073A JPS539803B2 (ja) 1973-01-13 1973-01-13
US348313A US3860763A (en) 1973-01-13 1973-04-05 Automatic exclusion circuit for a key telephone set
CA186,712A CA1002637A (en) 1973-01-13 1973-11-26 Automatic exclusion circuit for a key telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1251073A JPS539803B2 (ja) 1973-01-13 1973-01-13

Publications (2)

Publication Number Publication Date
JPS4996604A JPS4996604A (ja) 1974-09-12
JPS539803B2 true JPS539803B2 (ja) 1978-04-08

Family

ID=11807330

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1251073A Expired JPS539803B2 (ja) 1973-01-13 1973-01-13

Country Status (3)

Country Link
US (1) US3860763A (ja)
JP (1) JPS539803B2 (ja)
CA (1) CA1002637A (ja)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5011507A (ja) * 1973-05-31 1975-02-06
GB1480222A (en) * 1973-10-26 1977-07-20 Gte International Inc Telephone intercommunication system provided with a common communication line to which access is guarded
GB1480223A (en) * 1973-10-26 1977-07-20 Gte International Inc Telephone intercommunication system providing common access to a communication line
US3941943A (en) * 1974-08-08 1976-03-02 International Telephone And Telegraph Corporation Privacy circuit for key telephone systems
US4000376A (en) * 1975-03-31 1976-12-28 Viking Electronics, Inc. Telephone privacy device
US4039759A (en) * 1975-06-13 1977-08-02 Taylor James H Line security device
US4010332A (en) * 1975-08-11 1977-03-01 International Telephone And Telegraph Corporation Link circuit for intercom unit
US4053720A (en) * 1975-12-02 1977-10-11 International Telephone And Telegraph Corporation Automatic exclusion circuit
US4254306A (en) * 1975-12-26 1981-03-03 Iwasaki Tsushinki Kabushiki Kaisha Key telephone system
JPS52141104A (en) * 1976-05-19 1977-11-25 Iwatsu Electric Co Ltd Private talk system for telephone unit
JPS5279705A (en) * 1975-12-26 1977-07-05 Iwatsu Electric Co Ltd Privacy circuit in key telephone unit
JPS5294005A (en) * 1976-02-03 1977-08-08 Nitsuko Ltd Key telephone system
US4075434A (en) * 1976-03-25 1978-02-21 San/Bar Corporation Key telephone privacy exclusion apparatus
US4021621A (en) * 1976-05-07 1977-05-03 International Telephone And Telegraph Corporation Automatic group exclusion circuit for a key telephone system
US4081624A (en) * 1976-09-21 1978-03-28 Nippon Tsu Shin Kogyo K.K. Key telephone intercom line system
JPS5373009A (en) * 1976-12-13 1978-06-29 Iwatsu Electric Co Ltd Privacy call circuit of button telephone device
JPS5373010A (en) * 1976-12-13 1978-06-29 Iwatsu Electric Co Ltd Privacy call circuit of buttom telephon device
JPS5823999B2 (ja) * 1977-02-01 1983-05-18 日本電気株式会社 ボタン電話装置の局線回路
JPS54906A (en) * 1977-06-06 1979-01-06 Matsushita Electric Ind Co Ltd Key telephone set
US4218590A (en) * 1979-01-29 1980-08-19 Crest Industries, Inc. Key telephone system having automatic exclusion circuit for line privacy
US4346264A (en) * 1980-04-02 1982-08-24 Cindon Research Inc. Telephone call restriction apparatus
US4314108A (en) * 1980-04-02 1982-02-02 Cindon Research Inc. Key set toll restrictor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3514544A (en) * 1967-04-21 1970-05-26 Charles W Chambers Jr Party line privacy device
US3591725A (en) * 1969-07-11 1971-07-06 Bell Telephone Labor Inc Shared usage of key telephone system line circuits
US3725601A (en) * 1971-03-05 1973-04-03 Bell Telephone Labor Inc Direct station selection private intercom exchange system

Also Published As

Publication number Publication date
CA1002637A (en) 1976-12-28
JPS4996604A (ja) 1974-09-12
US3860763A (en) 1975-01-14

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