JPS52120705A - Privacy circuit of telephone - Google Patents

Privacy circuit of telephone

Info

Publication number
JPS52120705A
JPS52120705A JP3730676A JP3730676A JPS52120705A JP S52120705 A JPS52120705 A JP S52120705A JP 3730676 A JP3730676 A JP 3730676A JP 3730676 A JP3730676 A JP 3730676A JP S52120705 A JPS52120705 A JP S52120705A
Authority
JP
Japan
Prior art keywords
telephone
privacy circuit
privacy
circuit
featuring
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.)
Granted
Application number
JP3730676A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5519102B2 (enrdf_load_html_response
Inventor
Akinobu Sekiguchi
Yuichiro Takagawa
Minoru Sasai
Shoji Nojima
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.)
Nippon Telegraph and Telephone Corp
Kanda Tsushin Kogyo Co Ltd
Original Assignee
Nippon Telegraph and Telephone Corp
Kanda Tsushin Kogyo Co Ltd
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 Nippon Telegraph and Telephone Corp, Kanda Tsushin Kogyo Co Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP3730676A priority Critical patent/JPS52120705A/ja
Publication of JPS52120705A publication Critical patent/JPS52120705A/ja
Publication of JPS5519102B2 publication Critical patent/JPS5519102B2/ja
Granted 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
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H04M1/70—Lock-out or secrecy arrangements in party-line systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
JP3730676A 1976-04-05 1976-04-05 Privacy circuit of telephone Granted JPS52120705A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3730676A JPS52120705A (en) 1976-04-05 1976-04-05 Privacy circuit of telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3730676A JPS52120705A (en) 1976-04-05 1976-04-05 Privacy circuit of telephone

Publications (2)

Publication Number Publication Date
JPS52120705A true JPS52120705A (en) 1977-10-11
JPS5519102B2 JPS5519102B2 (enrdf_load_html_response) 1980-05-23

Family

ID=12494004

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3730676A Granted JPS52120705A (en) 1976-04-05 1976-04-05 Privacy circuit of telephone

Country Status (1)

Country Link
JP (1) JPS52120705A (enrdf_load_html_response)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5132474A (en) * 1974-09-13 1976-03-19 Yoei Seisakusho Kk Netsukokanki no seizohoho

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5132474A (en) * 1974-09-13 1976-03-19 Yoei Seisakusho Kk Netsukokanki no seizohoho

Also Published As

Publication number Publication date
JPS5519102B2 (enrdf_load_html_response) 1980-05-23

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