FR904080A - Installations téléphoniques à haut-parleurs - Google Patents

Installations téléphoniques à haut-parleurs

Info

Publication number
FR904080A
FR904080A FR904080DA FR904080A FR 904080 A FR904080 A FR 904080A FR 904080D A FR904080D A FR 904080DA FR 904080 A FR904080 A FR 904080A
Authority
FR
France
Prior art keywords
telephone systems
loudspeaker telephone
loudspeaker
systems
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
English (en)
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 FR904080A publication Critical patent/FR904080A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/02—Manually-operated control
    • H03G5/04—Manually-operated control in untuned amplifiers
    • H03G5/06—Manually-operated control in untuned amplifiers having discharge tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR904080D 1943-02-18 1944-02-17 Installations téléphoniques à haut-parleurs Expired FR904080A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL247563X 1943-02-18

Publications (1)

Publication Number Publication Date
FR904080A true FR904080A (fr) 1945-10-25

Family

ID=19780914

Family Applications (1)

Application Number Title Priority Date Filing Date
FR904080D Expired FR904080A (fr) 1943-02-18 1944-02-17 Installations téléphoniques à haut-parleurs

Country Status (4)

Country Link
BE (1) BE454425A (xx)
CH (1) CH247563A (xx)
FR (1) FR904080A (xx)
NL (1) NL58180C (xx)

Also Published As

Publication number Publication date
NL58180C (xx)
BE454425A (xx)
CH247563A (de) 1947-03-15

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