FR588714A - Improvements in telephones and similar instruments - Google Patents

Improvements in telephones and similar instruments

Info

Publication number
FR588714A
FR588714A FR588714DA FR588714A FR 588714 A FR588714 A FR 588714A FR 588714D A FR588714D A FR 588714DA FR 588714 A FR588714 A FR 588714A
Authority
FR
France
Prior art keywords
telephones
similar instruments
instruments
similar
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)
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Application granted granted Critical
Publication of FR588714A publication Critical patent/FR588714A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H04R9/063—Loudspeakers using a plurality of acoustic drivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/045—Mounting

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
FR588714D 1924-01-05 1924-11-08 Improvements in telephones and similar instruments Expired FR588714A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB38524A GB246096A (en) 1924-01-05 1924-01-05 Improvements in telephones and the like

Publications (1)

Publication Number Publication Date
FR588714A true FR588714A (en) 1925-05-14

Family

ID=9703474

Family Applications (2)

Application Number Title Priority Date Filing Date
FR588714D Expired FR588714A (en) 1924-01-05 1924-11-08 Improvements in telephones and similar instruments
FR29915D Expired FR29915E (en) 1924-01-05 1924-12-20 Improvements in telephones and similar instruments

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR29915D Expired FR29915E (en) 1924-01-05 1924-12-20 Improvements in telephones and similar instruments

Country Status (2)

Country Link
FR (2) FR588714A (en)
GB (1) GB246096A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU573382B2 (en) * 1984-10-15 1988-06-02 Deere & Company Ultrasonic horn with sidelobe suppression
US4713799A (en) * 1984-10-15 1987-12-15 Deere & Company Ultrasonic horn with sidelobe suppressing centerpiece

Also Published As

Publication number Publication date
GB246096A (en) 1926-01-28
FR29915E (en) 1925-12-10

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