FR623543A - - Google Patents

Info

Publication number
FR623543A
FR623543A FR623543DA FR623543A FR 623543 A FR623543 A FR 623543A FR 623543D A FR623543D A FR 623543DA FR 623543 A FR623543 A FR 623543A
Authority
FR
France
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)
Publication date
Application granted granted Critical
Publication of FR623543A publication Critical patent/FR623543A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR623543D Expired FR623543A (enrdf_load_html_response)

Publications (1)

Publication Number Publication Date
FR623543A true FR623543A (enrdf_load_html_response) 1927-06-25

Family

ID=1541299

Family Applications (1)

Application Number Title Priority Date Filing Date
FR623543D Expired FR623543A (enrdf_load_html_response)

Country Status (1)

Country Link
FR (1) FR623543A (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463762A (en) * 1941-11-14 1949-03-08 Automatic Elect Lab Electroacoustical transducer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463762A (en) * 1941-11-14 1949-03-08 Automatic Elect Lab Electroacoustical transducer

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