FR57897E - Telephone installation - Google Patents

Telephone installation

Info

Publication number
FR57897E
FR57897E FR57897DA FR57897E FR 57897 E FR57897 E FR 57897E FR 57897D A FR57897D A FR 57897DA FR 57897 E FR57897 E FR 57897E
Authority
FR
France
Prior art keywords
telephone installation
telephone
installation
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
Fritz Oestrich
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 FR57897E publication Critical patent/FR57897E/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
    • H04M1/02—Constructional features of telephone sets
    • H04M1/21—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
    • H04M1/215—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads by non-intrusive coupling means, e.g. acoustic couplers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR57897D 1947-12-26 1947-12-26 Telephone installation Expired FR57897E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR57897T 1947-12-26

Publications (1)

Publication Number Publication Date
FR57897E true FR57897E (en) 1953-09-18

Family

ID=8691865

Family Applications (1)

Application Number Title Priority Date Filing Date
FR57897D Expired FR57897E (en) 1947-12-26 1947-12-26 Telephone installation

Country Status (1)

Country Link
FR (1) FR57897E (en)

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