FR474181A - Electro-acoustic receiving device - Google Patents

Electro-acoustic receiving device

Info

Publication number
FR474181A
FR474181A FR474181DA FR474181A FR 474181 A FR474181 A FR 474181A FR 474181D A FR474181D A FR 474181DA FR 474181 A FR474181 A FR 474181A
Authority
FR
France
Prior art keywords
electro
receiving device
acoustic receiving
acoustic
receiving
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
Paul Franck-Valery
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.)
PAUL FRANCK VALERY
Original Assignee
PAUL FRANCK VALERY
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 PAUL FRANCK VALERY filed Critical PAUL FRANCK VALERY
Application granted granted Critical
Publication of FR474181A publication Critical patent/FR474181A/en
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)
FR474181D 1913-11-06 1913-11-06 Electro-acoustic receiving device Expired FR474181A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR474181T 1913-11-06

Publications (1)

Publication Number Publication Date
FR474181A true FR474181A (en) 1915-02-10

Family

ID=1512171

Family Applications (1)

Application Number Title Priority Date Filing Date
FR474181D Expired FR474181A (en) 1913-11-06 1913-11-06 Electro-acoustic receiving device

Country Status (1)

Country Link
FR (1) FR474181A (en)

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