DE273228C - - Google Patents

Info

Publication number
DE273228C
DE273228C DENDAT273228D DE273228DA DE273228C DE 273228 C DE273228 C DE 273228C DE NDAT273228 D DENDAT273228 D DE NDAT273228D DE 273228D A DE273228D A DE 273228DA DE 273228 C DE273228 C DE 273228C
Authority
DE
Germany
Prior art keywords
hook
hearing device
post
hearing
telephone
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
DENDAT273228D
Other languages
German (de)
English (en)
Publication of DE273228C publication Critical patent/DE273228C/de
Active legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems
    • H04R27/02—Amplifying systems for the deaf

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
DENDAT273228D Active DE273228C (cg-RX-API-DMAC7.html)

Publications (1)

Publication Number Publication Date
DE273228C true DE273228C (cg-RX-API-DMAC7.html)

Family

ID=529700

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT273228D Active DE273228C (cg-RX-API-DMAC7.html)

Country Status (1)

Country Link
DE (1) DE273228C (cg-RX-API-DMAC7.html)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544027A (en) * 1948-07-16 1951-03-06 Raymond E King Hearing aid attachment for use on french type telephones

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544027A (en) * 1948-07-16 1951-03-06 Raymond E King Hearing aid attachment for use on french type telephones

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