FR512242A - Improvements to telephone devices - Google Patents

Improvements to telephone devices

Info

Publication number
FR512242A
FR512242A FR512242A FR512242DA FR512242A FR 512242 A FR512242 A FR 512242A FR 512242 A FR512242 A FR 512242A FR 512242D A FR512242D A FR 512242DA FR 512242 A FR512242 A FR 512242A
Authority
FR
France
Prior art keywords
telephone devices
telephone
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
FR512242A
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR512242A publication Critical patent/FR512242A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/08—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with magnetostriction
    • B06B1/085—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with magnetostriction using multiple elements, e.g. arrays
    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Mechanical Engineering (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
FR512242A 1917-04-21 1920-03-16 Improvements to telephone devices Expired FR512242A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US163730A US1380981A (en) 1917-04-21 1917-04-21 Telephone

Publications (1)

Publication Number Publication Date
FR512242A true FR512242A (en) 1921-01-18

Family

ID=22591321

Family Applications (1)

Application Number Title Priority Date Filing Date
FR512242A Expired FR512242A (en) 1917-04-21 1920-03-16 Improvements to telephone devices

Country Status (2)

Country Link
US (1) US1380981A (en)
FR (1) FR512242A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2447333A (en) * 1931-12-30 1948-08-17 Us Navy Ultra-audible sound reception
US2452571A (en) * 1933-06-14 1948-11-02 Submarine Signal Co Sound signaling apparatus
US2855467A (en) * 1953-12-11 1958-10-07 Curry Electronics Inc Loud speakers
US4704556A (en) * 1983-12-05 1987-11-03 Leslie Kay Transducers
JP1634199S (en) * 2018-12-17 2019-06-17

Also Published As

Publication number Publication date
US1380981A (en) 1921-06-07

Similar Documents

Publication Publication Date Title
FR512242A (en) Improvements to telephone devices
FR491089A (en) Improvements to electrolytic devices
FR493433A (en) Improvements to radio-telegraph devices
FR520786A (en) Improvements to lifting devices
FR483029A (en) Improvements to telephone devices
FR484240A (en) Improvements to cinematographic devices
FR492631A (en) Improvements to cinematographic devices
FR489845A (en) Improvements to spraying devices
FR588947A (en) Improvements to gyroscopic devices
FR491628A (en) Improvements to combustion devices
FR488069A (en) Improvements to advertising devices
FR479344A (en) Improvements to telephone devices
FR484274A (en) Improvements to drying devices
FR485893A (en) Improvements to surgical devices
FR493086A (en) Improvements to vehicle-mounted lifting devices
FR519797A (en) Improvements to molding devices
FR493689A (en) Improvements to telephone cabinets
FR510216A (en) Improvements to phonographs
FR485193A (en) Improvements to lifting devices
FR487735A (en) Improvements to ventilation devices
FR482783A (en) Improvements to cinematographic devices
FR486391A (en) Improvements to cinematographic devices
FR497962A (en) Improvements to automatic telephone switches
FR518973A (en) Improvements to lifting devices
FR24053E (en) Improvements to hydroaeroplanes