DK624474A - - Google Patents

Info

Publication number
DK624474A
DK624474A DK624474A DK624474A DK624474A DK 624474 A DK624474 A DK 624474A DK 624474 A DK624474 A DK 624474A DK 624474 A DK624474 A DK 624474A DK 624474 A DK624474 A DK 624474A
Authority
DK
Denmark
Application number
DK624474A
Other languages
Danish (da)
Other versions
DK157646C (da
DK157646B (da
Inventor
E V Carlson
Original Assignee
Ind Research Prod Inc
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 Ind Research Prod Inc filed Critical Ind Research Prod Inc
Publication of DK624474A publication Critical patent/DK624474A/da
Publication of DK157646B publication Critical patent/DK157646B/da
Application granted granted Critical
Publication of DK157646C publication Critical patent/DK157646C/da

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
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/48—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using constructional means for obtaining a desired frequency response

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Headphones And Earphones (AREA)
DK624474A 1974-02-20 1974-11-29 Akustisk transmissionssystem DK157646C (da)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US44403674A 1974-02-20 1974-02-20
US44403674 1974-02-20

Publications (3)

Publication Number Publication Date
DK624474A true DK624474A (enExample) 1975-10-20
DK157646B DK157646B (da) 1990-01-29
DK157646C DK157646C (da) 1990-07-16

Family

ID=23763226

Family Applications (1)

Application Number Title Priority Date Filing Date
DK624474A DK157646C (da) 1974-02-20 1974-11-29 Akustisk transmissionssystem

Country Status (2)

Country Link
DK (1) DK157646C (enExample)
GB (1) GB1495292A (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT379927B (de) * 1984-07-18 1986-03-10 Akg Akustische Kino Geraete Leichte hoer-sprechgarnitur
GB2162342B (en) * 1984-07-25 1987-09-30 Loughran Edward Alarm time-pieces

Also Published As

Publication number Publication date
DK157646C (da) 1990-07-16
DE2506921A1 (de) 1975-08-28
GB1495292A (en) 1977-12-14
DK157646B (da) 1990-01-29
DE2506921B2 (de) 1977-06-23

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Legal Events

Date Code Title Description
PUP Patent expired