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FR452423A - Installation of megaphone for residential houses - Google Patents

Installation of megaphone for residential houses

Info

Publication number
FR452423A
FR452423A FR452423DA FR452423A FR 452423 A FR452423 A FR 452423A FR 452423D A FR452423D A FR 452423DA FR 452423 A FR452423 A FR 452423A
Authority
FR
France
Prior art keywords
megaphone
installation
residential houses
residential
houses
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
Johann Costantini
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.)
JOHANN COSTANTINI
Original Assignee
JOHANN COSTANTINI
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 JOHANN COSTANTINI filed Critical JOHANN COSTANTINI
Application granted granted Critical
Publication of FR452423A publication Critical patent/FR452423A/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)
FR452423D 1912-12-27 1912-12-27 Installation of megaphone for residential houses Expired FR452423A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR452423T 1912-12-27

Publications (1)

Publication Number Publication Date
FR452423A true FR452423A (en) 1913-05-16

Family

ID=1492646

Family Applications (1)

Application Number Title Priority Date Filing Date
FR452423D Expired FR452423A (en) 1912-12-27 1912-12-27 Installation of megaphone for residential houses

Country Status (1)

Country Link
FR (1) FR452423A (en)

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