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FR416479A - Récepteur téléphonique auxiliaire - Google Patents

Récepteur téléphonique auxiliaire

Info

Publication number
FR416479A
FR416479A FR416479DA FR416479A FR 416479 A FR416479 A FR 416479A FR 416479D A FR416479D A FR 416479DA FR 416479 A FR416479 A FR 416479A
Authority
FR
France
Prior art keywords
telephone receiver
auxiliary telephone
auxiliary
receiver
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)
Inventor
Wilhelm Schwarzhaupt
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR416479A publication Critical patent/FR416479A/fr
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
    • H04M1/2155—Acoustic coupling

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR416479D 1910-05-27 1910-05-27 Récepteur téléphonique auxiliaire Expired FR416479A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR416479T 1910-05-27

Publications (1)

Publication Number Publication Date
FR416479A true FR416479A (fr) 1910-10-21

Family

ID=1459971

Family Applications (1)

Application Number Title Priority Date Filing Date
FR416479D Expired FR416479A (fr) 1910-05-27 1910-05-27 Récepteur téléphonique auxiliaire

Country Status (1)

Country Link
FR (1) FR416479A (fr)

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