FR645103A - Perfectionnements aux téléphones acoustiques - Google Patents

Perfectionnements aux téléphones acoustiques

Info

Publication number
FR645103A
FR645103A FR645103DA FR645103A FR 645103 A FR645103 A FR 645103A FR 645103D A FR645103D A FR 645103DA FR 645103 A FR645103 A FR 645103A
Authority
FR
France
Prior art keywords
telephones
acoustic
acoustic telephones
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
Andre Morin
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 FR645103A publication Critical patent/FR645103A/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/22—Methods or devices for transmitting, conducting or directing sound for conducting sound through hollow pipes, e.g. speaking tubes

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR645103D 1927-12-03 1927-12-03 Perfectionnements aux téléphones acoustiques Expired FR645103A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR645103T 1927-12-03

Publications (1)

Publication Number Publication Date
FR645103A true FR645103A (fr) 1928-10-19

Family

ID=9000532

Family Applications (1)

Application Number Title Priority Date Filing Date
FR645103D Expired FR645103A (fr) 1927-12-03 1927-12-03 Perfectionnements aux téléphones acoustiques

Country Status (1)

Country Link
FR (1) FR645103A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4505358A (en) * 1982-01-11 1985-03-19 Ulrich Sielaff Voice communicator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4505358A (en) * 1982-01-11 1985-03-19 Ulrich Sielaff Voice communicator

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