FR487707A - Improvements to call devices for automatic telephone systems - Google Patents

Improvements to call devices for automatic telephone systems

Info

Publication number
FR487707A
FR487707A FR487707DA FR487707A FR 487707 A FR487707 A FR 487707A FR 487707D A FR487707D A FR 487707DA FR 487707 A FR487707 A FR 487707A
Authority
FR
France
Prior art keywords
telephone systems
automatic telephone
call devices
call
devices
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.)
Expired
Application number
Other languages
French (fr)
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR487707A publication Critical patent/FR487707A/en
Expired 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
    • H04M1/02—Constructional features of telephone sets
    • H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR487707D 1916-11-22 1917-11-21 Improvements to call devices for automatic telephone systems Expired FR487707A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US487707XA 1916-11-22 1916-11-22

Publications (1)

Publication Number Publication Date
FR487707A true FR487707A (en) 1918-07-23

Family

ID=1524149

Family Applications (1)

Application Number Title Priority Date Filing Date
FR487707D Expired FR487707A (en) 1916-11-22 1917-11-21 Improvements to call devices for automatic telephone systems

Country Status (1)

Country Link
FR (1) FR487707A (en)

Similar Documents

Publication Publication Date Title
FR487186A (en) Improvements to call indicators for automatic telephone systems
FR487707A (en) Improvements to call devices for automatic telephone systems
FR436734A (en) Call device for telephone systems
FR495108A (en) Announcer for telephone calls
FR487308A (en) Improvements to automatic telephone systems
FR472811A (en) Call bell relay applicable to telephone circuits
FR484039A (en) Improvements to intercom telephone systems
FR440166A (en) Improvements to recording devices for telephone systems
FR487962A (en) Improvements to automatic telephone systems
FR487064A (en) Improvements to automatic telephone systems
FR444538A (en) Loudspeaker telephone for aerial locomotion
FR462040A (en) Call system for shared lines
FR518763A (en) Enhancements to automatic switches for telephone systems
FR456564A (en) Transmitter for automatic telephone systems
FR487178A (en) Improvements to telephone call counting systems
CH59766A (en) Telephone call counter system
AU634312A (en) Call distributing telephone system
FR20526E (en) Improvements to charged telephone line systems for phantom circuits
FR20551E (en) Improvements to charged telephone line systems for phantom circuits
FR20552E (en) Improvements to charged telephone line systems for phantom circuits
FR516354A (en) Improvements to telephone exchange systems
FR514321A (en) Reinforcement device for normal long distance telephones
FR487177A (en) Improvements to semi-automatic telephone systems
FR506270A (en) Improvements to semi-automatic telephone systems
FR20762E (en) Improvement in tape recorders for telephone calls