FR618036A - Improvements to speaker phones - Google Patents

Improvements to speaker phones

Info

Publication number
FR618036A
FR618036A FR618036DA FR618036A FR 618036 A FR618036 A FR 618036A FR 618036D A FR618036D A FR 618036DA FR 618036 A FR618036 A FR 618036A
Authority
FR
France
Prior art keywords
speaker phones
phones
speaker
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
Sidney George Brown
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 FR618036A publication Critical patent/FR618036A/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)
FR618036D 1925-09-18 1926-06-22 Improvements to speaker phones Expired FR618036A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB618036X 1925-09-18

Publications (1)

Publication Number Publication Date
FR618036A true FR618036A (en) 1927-03-02

Family

ID=10487478

Family Applications (1)

Application Number Title Priority Date Filing Date
FR618036D Expired FR618036A (en) 1925-09-18 1926-06-22 Improvements to speaker phones

Country Status (1)

Country Link
FR (1) FR618036A (en)

Similar Documents

Publication Publication Date Title
FR556412A (en) Improvements to speaker phones
FR618036A (en) Improvements to speaker phones
FR585125A (en) Improvements to telephone headsets
FR623916A (en) Improvements to telephone loudspeakers
FR630770A (en) Improvements to commonplace
FR597247A (en) Improvements to framing
FR604660A (en) Improvements to telephone receivers
FR579132A (en) Improvements to audio phones
FR613355A (en) Improvements to telephone transmitters
FR605750A (en) Improvements to telephone transmitters
FR687655A (en) Improvements to telephone loudspeakers
FR613059A (en) Improvements to loudspeaker telephone receivers
FR616735A (en) Improvements to loudspeaker telephone receivers
FR577423A (en) Improvements to phones
FR645103A (en) Improvements to acoustic telephones
FR605135A (en) Improvements to revivals
FR615366A (en) Improvements to aeromotors
FR605808A (en) Improvements to shoehorns
FR608158A (en) Improvements to revivals
FR598346A (en) Improvements to speaker phone receivers
FR31600E (en) Improvements to telephone receivers
FR591763A (en) Improvements to telephone receivers
FR601707A (en) Improvements to telephone receivers
FR616267A (en) Improvements to telephone receivers
FR616598A (en) Loud speaker