FR839464A - Improvements to telephone systems and apparatus intended to be used in combination with them - Google Patents

Improvements to telephone systems and apparatus intended to be used in combination with them

Info

Publication number
FR839464A
FR839464A FR839464DA FR839464A FR 839464 A FR839464 A FR 839464A FR 839464D A FR839464D A FR 839464DA FR 839464 A FR839464 A FR 839464A
Authority
FR
France
Prior art keywords
combination
telephone systems
apparatus intended
intended
telephone
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)
Inventor
George Michaelson
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 filed Critical
Application granted granted Critical
Publication of FR839464A publication Critical patent/FR839464A/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
    • H04M1/57—Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set
    • H04M1/573—Line monitoring circuits for detecting caller identification
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
FR839464D 1937-06-17 1938-07-17 Improvements to telephone systems and apparatus intended to be used in combination with them Expired FR839464A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16844/37A GB502605A (en) 1937-06-17 1937-06-17 Improvements in or relating to telephone systems and apparatus for use in connection therewith

Publications (1)

Publication Number Publication Date
FR839464A true FR839464A (en) 1939-04-04

Family

ID=10084692

Family Applications (1)

Application Number Title Priority Date Filing Date
FR839464D Expired FR839464A (en) 1937-06-17 1938-07-17 Improvements to telephone systems and apparatus intended to be used in combination with them

Country Status (3)

Country Link
US (1) US2222751A (en)
FR (1) FR839464A (en)
GB (1) GB502605A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2764633A (en) * 1954-12-14 1956-09-25 Serrataco John R Fernandez Combined telegraph and telephone system

Also Published As

Publication number Publication date
GB502605A (en) 1939-03-17
US2222751A (en) 1940-11-26

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