FR608242A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR608242A
FR608242A FR608242DA FR608242A FR 608242 A FR608242 A FR 608242A FR 608242D A FR608242D A FR 608242DA FR 608242 A FR608242 A FR 608242A
Authority
FR
France
Prior art keywords
telephone systems
telephone
systems
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR608242A publication Critical patent/FR608242A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR608242D 1925-11-27 1925-11-27 Improvements to telephone systems Expired FR608242A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR608242T 1925-11-27

Publications (1)

Publication Number Publication Date
FR608242A true FR608242A (en) 1926-07-23

Family

ID=8975935

Family Applications (2)

Application Number Title Priority Date Filing Date
FR33772D Expired FR33772E (en) 1925-11-27
FR608242D Expired FR608242A (en) 1925-11-27 1925-11-27 Improvements to telephone systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR33772D Expired FR33772E (en) 1925-11-27

Country Status (2)

Country Link
FR (2) FR608242A (en)
NL (1) NL18632C (en)

Also Published As

Publication number Publication date
NL18632C (en)
FR33772E (en) 1929-03-01

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