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FR618338A - Improvements to telephone reception devices - Google Patents

Improvements to telephone reception devices

Info

Publication number
FR618338A
FR618338A FR618338DA FR618338A FR 618338 A FR618338 A FR 618338A FR 618338D A FR618338D A FR 618338DA FR 618338 A FR618338 A FR 618338A
Authority
FR
France
Prior art keywords
reception devices
telephone reception
telephone
devices
reception
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.)
TELEPHONE AUX Y Co Inc
Original Assignee
TELEPHONE AUX Y Co Inc
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 TELEPHONE AUX Y Co Inc filed Critical TELEPHONE AUX Y Co Inc
Application granted granted Critical
Publication of FR618338A publication Critical patent/FR618338A/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
    • H04M1/2155—Acoustic coupling

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR618338D 1925-06-09 1926-06-07 Improvements to telephone reception devices Expired FR618338A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US618338XA 1925-06-09 1925-06-09

Publications (1)

Publication Number Publication Date
FR618338A true FR618338A (en) 1927-03-07

Family

ID=22038428

Family Applications (1)

Application Number Title Priority Date Filing Date
FR618338D Expired FR618338A (en) 1925-06-09 1926-06-07 Improvements to telephone reception devices

Country Status (1)

Country Link
FR (1) FR618338A (en)

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