DE144581C - - Google Patents

Info

Publication number
DE144581C
DE144581C DENDAT144581D DE144581DA DE144581C DE 144581 C DE144581 C DE 144581C DE NDAT144581 D DENDAT144581 D DE NDAT144581D DE 144581D A DE144581D A DE 144581DA DE 144581 C DE144581 C DE 144581C
Authority
DE
Germany
Prior art keywords
speaking
mouth
cone
speaker
sound
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.)
Active
Application number
DENDAT144581D
Other languages
German (de)
English (en)
Publication of DE144581C publication Critical patent/DE144581C/de
Active legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
    • A61F11/30—Non-electric hearing aids, e.g. ear trumpets, sound amplifiers or ear-shells

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Acoustics & Sound (AREA)
  • Biophysics (AREA)
  • Otolaryngology (AREA)
  • Psychology (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
DENDAT144581D Active DE144581C (enrdf_load_stackoverflow)

Publications (1)

Publication Number Publication Date
DE144581C true DE144581C (enrdf_load_stackoverflow)

Family

ID=411985

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT144581D Active DE144581C (enrdf_load_stackoverflow)

Country Status (1)

Country Link
DE (1) DE144581C (enrdf_load_stackoverflow)

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