CH98921A - Sound transmitters for telephones. - Google Patents

Sound transmitters for telephones.

Info

Publication number
CH98921A
CH98921A CH98921DA CH98921A CH 98921 A CH98921 A CH 98921A CH 98921D A CH98921D A CH 98921DA CH 98921 A CH98921 A CH 98921A
Authority
CH
Switzerland
Prior art keywords
telephones
sound transmitters
transmitters
sound
Prior art date
Application number
Other languages
German (de)
Inventor
Arthur Watkins Frederick
Original Assignee
Arthur Watkins Frederick
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 Arthur Watkins Frederick filed Critical Arthur Watkins Frederick
Publication of CH98921A publication Critical patent/CH98921A/en

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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
CH98921D 1921-07-25 1921-07-26 Sound transmitters for telephones. CH98921A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1990821A GB185294A (en) 1921-07-25 1921-07-25 Improvements in sound transmitters

Publications (1)

Publication Number Publication Date
CH98921A true CH98921A (en) 1923-04-16

Family

ID=10137133

Family Applications (1)

Application Number Title Priority Date Filing Date
CH98921D CH98921A (en) 1921-07-25 1921-07-26 Sound transmitters for telephones.

Country Status (2)

Country Link
CH (1) CH98921A (en)
GB (1) GB185294A (en)

Also Published As

Publication number Publication date
GB185294A (en) 1922-09-07

Similar Documents

Publication Publication Date Title
CH98921A (en) Sound transmitters for telephones.
CH102427A (en) Improvement provided to telephone transmitters.
AT94097B (en) Telephone dialer.
DK31706C (en) Telephone or Microphone carrier.
FR553457A (en) Phone
AT99338B (en) Telephone system for optional calls.
DK31804C (en) Adjustable Telephone or Microphone Carrier.
FR548289A (en) Telephone microphones
AT96063B (en) Telephone transmitter arrangement.
DK35807C (en) Telephone system.
DK34694C (en) Telephone system.
DK33647C (en) Telephone system.
FR542305A (en) Diaphragm for telephone transmitter
DK32731C (en) Ringtone for Bells.
FR570746A (en) Loudspeaker telephone receiver
AT91060B (en) Additional amplifier device for any telephone set.
AT103673B (en) Telephone dialer.
ES70366A1 (en) Telephone hearing.
DK29167C (en) Listening microphone.
AT89487B (en) Self-dialing telephone system for company line connections.
FR29698E (en) Loudspeaker telephone
DK31751C (en) Audio Transmission Device for Phones.
AT104322B (en) Telephone.
DK30698C (en) Phone holder.
DK34341C (en) Sound funnel for voice machines.