BE440889A - - Google Patents

Info

Publication number
BE440889A
BE440889A BE440889DA BE440889A BE 440889 A BE440889 A BE 440889A BE 440889D A BE440889D A BE 440889DA BE 440889 A BE440889 A BE 440889A
Authority
BE
Belgium
Application number
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.)
Publication of BE440889A publication Critical patent/BE440889A/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
    • 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
    • H04R1/12—Sanitary or hygienic devices for mouthpieces or earpieces, e.g. for protecting against infection

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Telephone Set Structure (AREA)
BE440889D 1939-11-22 BE440889A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL220359X 1939-11-22

Publications (1)

Publication Number Publication Date
BE440889A true BE440889A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)

Family

ID=19779319

Family Applications (1)

Application Number Title Priority Date Filing Date
BE440889D BE440889A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html) 1939-11-22

Country Status (4)

Country Link
BE (1) BE440889A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
CH (1) CH220359A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
DE (1) DE737071C (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
FR (1) FR871481A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1078179B (de) * 1957-02-01 1960-03-24 Draegerwerk Ag Mikrophon fuer Gasmasken

Also Published As

Publication number Publication date
CH220359A (de) 1942-03-31
FR871481A (fr) 1942-04-27
DE737071C (de) 1943-07-05

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