[go: up one dir, main page]

FR579797A - Loudspeaker enhancements for cordless telephony devices - Google Patents

Loudspeaker enhancements for cordless telephony devices

Info

Publication number
FR579797A
FR579797A FR579797DA FR579797A FR 579797 A FR579797 A FR 579797A FR 579797D A FR579797D A FR 579797DA FR 579797 A FR579797 A FR 579797A
Authority
FR
France
Prior art keywords
enhancements
loudspeaker
telephony devices
cordless telephony
cordless
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
William Henry Johns
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.)
Johnson and Phillips Ltd
Original Assignee
Johnson and Phillips 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 Johnson and Phillips Ltd filed Critical Johnson and Phillips Ltd
Application granted granted Critical
Publication of FR579797A publication Critical patent/FR579797A/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
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
    • H04R13/02—Telephone receivers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
FR579797D 1923-04-10 1924-04-04 Loudspeaker enhancements for cordless telephony devices Expired FR579797A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB978223A GB218031A (en) 1923-04-10 1923-04-10 Improvements in and relating to loud speakers for use in wireless telephone apparatus

Publications (1)

Publication Number Publication Date
FR579797A true FR579797A (en) 1924-10-23

Family

ID=9878647

Family Applications (1)

Application Number Title Priority Date Filing Date
FR579797D Expired FR579797A (en) 1923-04-10 1924-04-04 Loudspeaker enhancements for cordless telephony devices

Country Status (2)

Country Link
FR (1) FR579797A (en)
GB (1) GB218031A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5296292A (en) * 1990-09-04 1994-03-22 W. L. Gore & Associates, Inc. Elongated cylindrical tensile article

Also Published As

Publication number Publication date
GB218031A (en) 1924-07-03

Similar Documents

Publication Publication Date Title
FR618709A (en) Improvements to grippers for lifting devices
FR579797A (en) Loudspeaker enhancements for cordless telephony devices
FR579798A (en) Loudspeaker enhancements for cordless telephony devices
FR579799A (en) Loudspeaker enhancements for cordless telephony devices
FR571985A (en) Improvements to speaker devices for wireless telephony
FR562328A (en) Improvements to Receiving Apparatus for Telegraphy, Cordless Telephony and Similar Applications
FR29748E (en) Vibrating membrane for telephone devices
FR590332A (en) Vibrating membrane for telephone devices
FR561688A (en) Loudspeaker for telephony and cordless telephony
FR557404A (en) Telephone Device Mute Improvements
FR561357A (en) Membrane for hearing devices
FR620883A (en) Improvements to speakerphone devices for telephony
FR596817A (en) Improvements to telephone receivers for loudspeakers
FR641957A (en) Furniture refinements for cordless telephony devices
FR538944A (en) Improvements to hearing devices for telephone applications
FR618338A (en) Improvements to telephone reception devices
FR579411A (en) Phone covers enhancements
FR583643A (en) Improvements to headsets for telephone receivers
FR573000A (en) Loudspeaker for telephone device
FR596065A (en) Improvements to transmission circuits for telephone currents
FR546094A (en) Improvements to capacitors for projection devices
FR584079A (en) Amplifier tube for cordless telephony
FR576443A (en) Improvements to telephone devices
FR577457A (en) Improvements to amplifying devices for telegraphy and wireless telephony
FR570117A (en) Vibrating membrane for telephone devices