NL145737B - CIRCUIT FOR A TELEPHONE STATION WITH A KEYBOARD. - Google Patents

CIRCUIT FOR A TELEPHONE STATION WITH A KEYBOARD.

Info

Publication number
NL145737B
NL145737B NL6410546A NL6410546A NL145737B NL 145737 B NL145737 B NL 145737B NL 6410546 A NL6410546 A NL 6410546A NL 6410546 A NL6410546 A NL 6410546A NL 145737 B NL145737 B NL 145737B
Authority
NL
Netherlands
Prior art keywords
keyboard
circuit
telephone station
telephone
station
Prior art date
Application number
NL6410546A
Other languages
Dutch (nl)
Other versions
NL6410546A (en
Original Assignee
Siemens Ag
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 Siemens Ag filed Critical Siemens Ag
Publication of NL6410546A publication Critical patent/NL6410546A/xx
Publication of NL145737B publication Critical patent/NL145737B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Push-Button Switches (AREA)
NL6410546A 1963-09-11 1964-09-10 CIRCUIT FOR A TELEPHONE STATION WITH A KEYBOARD. NL145737B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES87233A DE1179264B (en) 1963-09-11 1963-09-11 Circuit arrangement for telephone stations with control keyboard

Publications (2)

Publication Number Publication Date
NL6410546A NL6410546A (en) 1965-03-12
NL145737B true NL145737B (en) 1975-04-15

Family

ID=7513609

Family Applications (1)

Application Number Title Priority Date Filing Date
NL6410546A NL145737B (en) 1963-09-11 1964-09-10 CIRCUIT FOR A TELEPHONE STATION WITH A KEYBOARD.

Country Status (6)

Country Link
BE (1) BE652976A (en)
CH (1) CH423889A (en)
DE (1) DE1179264B (en)
GB (1) GB1030074A (en)
NL (1) NL145737B (en)
SE (1) SE368894B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107800419A (en) * 2016-09-07 2018-03-13 宏百贸易有限公司 A kind of button, electronic circuit, keyboard

Also Published As

Publication number Publication date
BE652976A (en) 1965-03-11
NL6410546A (en) 1965-03-12
DE1179264B (en) 1964-10-08
GB1030074A (en) 1966-05-18
SE368894B (en) 1974-07-22
CH423889A (en) 1966-11-15

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