GB191124098A - Improvements in Sound Amplifying Devices for Telephones, Ear and Speaking-trumpets, and the like. - Google Patents

Improvements in Sound Amplifying Devices for Telephones, Ear and Speaking-trumpets, and the like.

Info

Publication number
GB191124098A
GB191124098A GB191124098DA GB191124098A GB 191124098 A GB191124098 A GB 191124098A GB 191124098D A GB191124098D A GB 191124098DA GB 191124098 A GB191124098 A GB 191124098A
Authority
GB
United Kingdom
Prior art keywords
speaking
trumpets
telephones
ear
sound amplifying
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
English (en)
Inventor
Hans Christian Petersen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of GB191124098A publication Critical patent/GB191124098A/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
    • 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)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Resistance Heating (AREA)
GB191124098D 1910-11-11 1911-10-31 Improvements in Sound Amplifying Devices for Telephones, Ear and Speaking-trumpets, and the like. Expired GB191124098A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK435921X 1910-11-11

Publications (1)

Publication Number Publication Date
GB191124098A true GB191124098A (en) 1912-05-09

Family

ID=32523874

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191124098D Expired GB191124098A (en) 1910-11-11 1911-10-31 Improvements in Sound Amplifying Devices for Telephones, Ear and Speaking-trumpets, and the like.

Country Status (3)

Country Link
DE (1) DE245049C (enrdf_load_stackoverflow)
FR (1) FR435921A (enrdf_load_stackoverflow)
GB (1) GB191124098A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012222447B3 (de) * 2012-12-06 2014-05-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Lautsprecher mit druck-kompensations-element

Also Published As

Publication number Publication date
DE245049C (enrdf_load_stackoverflow)
FR435921A (fr) 1912-03-13

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