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FR610821A - Improvements to sound amplifying devices including wireless telephone receivers - Google Patents

Improvements to sound amplifying devices including wireless telephone receivers

Info

Publication number
FR610821A
FR610821A FR610821DA FR610821A FR 610821 A FR610821 A FR 610821A FR 610821D A FR610821D A FR 610821DA FR 610821 A FR610821 A FR 610821A
Authority
FR
France
Prior art keywords
devices including
wireless telephone
including wireless
sound amplifying
amplifying devices
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
Edward Alfred Graham
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 FR610821A publication Critical patent/FR610821A/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
    • G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
    • G10K11/025—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators horns for impedance matching

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR610821D 1925-09-11 1926-02-10 Improvements to sound amplifying devices including wireless telephone receivers Expired FR610821A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB610821X 1925-09-11

Publications (1)

Publication Number Publication Date
FR610821A true FR610821A (en) 1926-09-14

Family

ID=10486586

Family Applications (1)

Application Number Title Priority Date Filing Date
FR610821D Expired FR610821A (en) 1925-09-11 1926-02-10 Improvements to sound amplifying devices including wireless telephone receivers

Country Status (1)

Country Link
FR (1) FR610821A (en)

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