FR761850A - Improvements to electrical sound producing devices and, in particular, to electrical warning devices - Google Patents

Improvements to electrical sound producing devices and, in particular, to electrical warning devices

Info

Publication number
FR761850A
FR761850A FR761850DA FR761850A FR 761850 A FR761850 A FR 761850A FR 761850D A FR761850D A FR 761850DA FR 761850 A FR761850 A FR 761850A
Authority
FR
France
Prior art keywords
electrical
devices
sound producing
warning devices
warning
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
Rene Clammer
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 FR761850A publication Critical patent/FR761850A/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
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means
    • G10K9/15—Self-interrupting arrangements

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR761850D 1932-12-23 1932-12-23 Improvements to electrical sound producing devices and, in particular, to electrical warning devices Expired FR761850A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR761850T 1932-12-23

Publications (1)

Publication Number Publication Date
FR761850A true FR761850A (en) 1934-03-28

Family

ID=9174550

Family Applications (1)

Application Number Title Priority Date Filing Date
FR761850D Expired FR761850A (en) 1932-12-23 1932-12-23 Improvements to electrical sound producing devices and, in particular, to electrical warning devices

Country Status (1)

Country Link
FR (1) FR761850A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4534661A (en) * 1977-08-25 1985-08-13 Kabushiki Kaisha Suwa Seikosha Electric alarm wristwatch including cylindrical sound tube for transmitting sound

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4534661A (en) * 1977-08-25 1985-08-13 Kabushiki Kaisha Suwa Seikosha Electric alarm wristwatch including cylindrical sound tube for transmitting sound

Similar Documents

Publication Publication Date Title
CH208021A (en) Device with directional effect for receiving sound waves and converting them into electrical vibrations.
FR761850A (en) Improvements to electrical sound producing devices and, in particular, to electrical warning devices
FR712387A (en) Loudspeaker enhancements
FR43935E (en) Improvements to electrical sound producing devices and, in particular, to electrical warning devices
FR705640A (en) Improvement in the electric reproducers of sounds
FR843628A (en) Loudspeaker enhancements
FR740743A (en) Improvements to electrical warning devices
FR705658A (en) Loudspeaker enhancements
FR734337A (en) Improvements to listening devices through sound
FR765856A (en) Improvements in microphones and receivers
FR704537A (en) Improvement in electrical sound reproducing devices
CA324321A (en) Sound producing device
FR753820A (en) Improvements to hearing devices
FR42419E (en) Improvements to hearing devices
FR697941A (en) Improvement in sound tracking devices
FR708281A (en) Improvements made to electro-dynamic devices to reproduce sound
FR750682A (en) Improvements made to clocks, alarm clocks and electric clocks
FR799113A (en) Improvement in deodorizing devices
FR837286A (en) Improvements in signaling and advertising apparatus and the like
FR734338A (en) Improvements to listening devices
FR758073A (en) Improvement in filtration devices
FR715456A (en) Advanced sound reproducer
FR683779A (en) Improvements to electrical devices reproducing sound
CA307165A (en) Sound producing device
DK47866C (en) Combined electric Light and Sound signal device.