FR888179A - Loudspeaker installation with change of direction of conversation for the transmission of orders or notices - Google Patents

Loudspeaker installation with change of direction of conversation for the transmission of orders or notices

Info

Publication number
FR888179A
FR888179A FR888179DA FR888179A FR 888179 A FR888179 A FR 888179A FR 888179D A FR888179D A FR 888179DA FR 888179 A FR888179 A FR 888179A
Authority
FR
France
Prior art keywords
notices
conversation
orders
transmission
change
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs 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.)
Filing date
Publication date
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Application granted granted Critical
Publication of FR888179A publication Critical patent/FR888179A/en
Expired legal-status Critical Current

Links

Classifications

    • 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)
FR888179D 1938-12-30 1942-10-05 Loudspeaker installation with change of direction of conversation for the transmission of orders or notices Expired FR888179A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE216274X 1938-12-30

Publications (1)

Publication Number Publication Date
FR888179A true FR888179A (en) 1943-12-06

Family

ID=5828347

Family Applications (1)

Application Number Title Priority Date Filing Date
FR888179D Expired FR888179A (en) 1938-12-30 1942-10-05 Loudspeaker installation with change of direction of conversation for the transmission of orders or notices

Country Status (4)

Country Link
BE (1) BE436654A (en)
CH (1) CH216274A (en)
FR (1) FR888179A (en)
NL (1) NL58582C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972766C (en) * 1941-12-14 1959-09-24 Normalzeit G M B H Intercom with several stations and a central amplifier

Also Published As

Publication number Publication date
NL58582C (en)
CH216274A (en) 1941-08-15
BE436654A (en)

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