FR871481A - Organe additionnel pour appareil téléphonique - Google Patents

Organe additionnel pour appareil téléphonique

Info

Publication number
FR871481A
FR871481A FR871481DA FR871481A FR 871481 A FR871481 A FR 871481A FR 871481D A FR871481D A FR 871481DA FR 871481 A FR871481 A FR 871481A
Authority
FR
France
Prior art keywords
additional
telephone
telephone device
additional device
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)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of FR871481A publication Critical patent/FR871481A/fr
Expired legal-status Critical Current

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)
FR871481D 1939-11-22 1941-04-10 Organe additionnel pour appareil téléphonique Expired FR871481A (fr)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
FR871481A true FR871481A (fr) 1942-04-27

Family

ID=19779319

Family Applications (1)

Application Number Title Priority Date Filing Date
FR871481D Expired FR871481A (fr) 1939-11-22 1941-04-10 Organe additionnel pour appareil téléphonique

Country Status (4)

Country Link
BE (1) BE440889A (fr)
CH (1) CH220359A (fr)
DE (1) DE737071C (fr)
FR (1) FR871481A (fr)

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
DE737071C (de) 1943-07-05
BE440889A (fr)

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