CH551726A - Vorrichtung zur tastwahl von zeichen, insbesondere fernsprechrufnummern. - Google Patents

Vorrichtung zur tastwahl von zeichen, insbesondere fernsprechrufnummern.

Info

Publication number: CH551726A
Authority: CH; Switzerland
Prior art keywords: telephone numbers; particular telephone; dialing characters; dialing; characters
Prior art date: 1971-04-02

Application number

CH477772A

Other languages

German (de)

English (en)

Original Assignee

Krone Gmbh

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.)

1971-04-02

Filing date

1972-03-30

Publication date

1974-07-15

1972-03-30 Application filed by Krone Gmbh filed Critical Krone Gmbh

1974-07-15 Publication of CH551726A publication Critical patent/CH551726A/xx

Links

Classifications

- 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)
Push-Button Switches (AREA)

CH477772A 1971-04-02 1972-03-30 Vorrichtung zur tastwahl von zeichen, insbesondere fernsprechrufnummern. CH551726A (de)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DE2116181		1971-04-02

Publications (1)

Publication Number	Publication Date
CH551726A true CH551726A (de)	1974-07-15

Family

ID=5803715

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CH477772A CH551726A (de)	1971-04-02	1972-03-30	Vorrichtung zur tastwahl von zeichen, insbesondere fernsprechrufnummern.

Country Status (5)

Country	Link
BE (1)	BE781389A (2)
CH (1)	CH551726A (2)
DE (1)	DE2116181B1 (2)
FR (1)	FR2136101A5 (2)
NL (1)	NL7204336A (2)

1971
- 1971-04-02 DE DE2116181A patent/DE2116181B1/de active Pending
1972
- 1972-03-29 BE BE781389A patent/BE781389A/xx unknown
- 1972-03-30 FR FR7211328A patent/FR2136101A5/fr not_active Expired
- 1972-03-30 CH CH477772A patent/CH551726A/xx not_active IP Right Cessation
- 1972-03-30 NL NL7204336A patent/NL7204336A/xx unknown

Also Published As

Publication number	Publication date
FR2136101A5 (2)	1972-12-22
DE2116181B1 (de)	1972-10-05
BE781389A (fr)	1972-07-17
NL7204336A (2)	1972-10-04

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Legal Events

Date	Code	Title	Description
1975-10-31	PL	Patent ceased