KR200165096Y1 - Doorphone circuit connected with a key telephone system - Google Patents

Doorphone circuit connected with a key telephone system Download PDF

Info

Publication number
KR200165096Y1
KR200165096Y1 KR2019970024244U KR19970024244U KR200165096Y1 KR 200165096 Y1 KR200165096 Y1 KR 200165096Y1 KR 2019970024244 U KR2019970024244 U KR 2019970024244U KR 19970024244 U KR19970024244 U KR 19970024244U KR 200165096 Y1 KR200165096 Y1 KR 200165096Y1
Authority
KR
South Korea
Prior art keywords
circuit connected
telephone system
key telephone
doorphone
doorphone circuit
Prior art date
Application number
KR2019970024244U
Other languages
Korean (ko)
Other versions
KR19990010913U (en
Inventor
Ho-Joon Lee
Original Assignee
Samsung Electronics 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 Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to KR2019970024244U priority Critical patent/KR200165096Y1/en
Publication of KR19990010913U publication Critical patent/KR19990010913U/en
Application granted granted Critical
Publication of KR200165096Y1 publication Critical patent/KR200165096Y1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
    • H04M11/025—Door telephones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6016—Substation equipment, e.g. for use by subscribers including speech amplifiers in the receiver circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
KR2019970024244U 1997-08-30 1997-08-30 Doorphone circuit connected with a key telephone system KR200165096Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019970024244U KR200165096Y1 (en) 1997-08-30 1997-08-30 Doorphone circuit connected with a key telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019970024244U KR200165096Y1 (en) 1997-08-30 1997-08-30 Doorphone circuit connected with a key telephone system

Publications (2)

Publication Number Publication Date
KR19990010913U KR19990010913U (en) 1999-03-25
KR200165096Y1 true KR200165096Y1 (en) 2000-01-15

Family

ID=19509299

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019970024244U KR200165096Y1 (en) 1997-08-30 1997-08-30 Doorphone circuit connected with a key telephone system

Country Status (1)

Country Link
KR (1) KR200165096Y1 (en)

Also Published As

Publication number Publication date
KR19990010913U (en) 1999-03-25

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Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
REGI Registration of establishment
FPAY Annual fee payment

Payment date: 20070910

Year of fee payment: 9

LAPS Lapse due to unpaid annual fee