FR1547750A - Duplex telephone communication device - Google Patents

Duplex telephone communication device

Info

Publication number
FR1547750A
FR1547750A FR125240A FR125240A FR1547750A FR 1547750 A FR1547750 A FR 1547750A FR 125240 A FR125240 A FR 125240A FR 125240 A FR125240 A FR 125240A FR 1547750 A FR1547750 A FR 1547750A
Authority
FR
France
Prior art keywords
communication device
telephone communication
duplex telephone
duplex
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
FR125240A
Other languages
French (fr)
Inventor
Alfred Hoffmann
Raymond Liebert
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
Priority to FR125240A priority Critical patent/FR1547750A/en
Application granted granted Critical
Publication of FR1547750A publication Critical patent/FR1547750A/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
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/08—Protective coverings for parts of machine tools; Splash guards

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
FR125240A 1967-10-20 1967-10-20 Duplex telephone communication device Expired FR1547750A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR125240A FR1547750A (en) 1967-10-20 1967-10-20 Duplex telephone communication device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR125240A FR1547750A (en) 1967-10-20 1967-10-20 Duplex telephone communication device

Publications (1)

Publication Number Publication Date
FR1547750A true FR1547750A (en) 1968-11-29

Family

ID=8640433

Family Applications (1)

Application Number Title Priority Date Filing Date
FR125240A Expired FR1547750A (en) 1967-10-20 1967-10-20 Duplex telephone communication device

Country Status (1)

Country Link
FR (1) FR1547750A (en)

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