CH220359A - Extension piece to telephone device. - Google Patents

Extension piece to telephone device.

Info

Publication number
CH220359A
CH220359A CH220359DA CH220359A CH 220359 A CH220359 A CH 220359A CH 220359D A CH220359D A CH 220359DA CH 220359 A CH220359 A CH 220359A
Authority
CH
Switzerland
Prior art keywords
telephone device
extension piece
extension
piece
telephone
Prior art date
Application number
Other languages
German (de)
Inventor
Gloeilampenfabrieken N Philips
Original Assignee
Philips 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 Nv filed Critical Philips Nv
Publication of CH220359A publication Critical patent/CH220359A/en

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)
CH220359D 1939-11-22 1941-02-07 Extension piece to telephone device. CH220359A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
CH220359A true CH220359A (en) 1942-03-31

Family

ID=19779319

Family Applications (1)

Application Number Title Priority Date Filing Date
CH220359D CH220359A (en) 1939-11-22 1941-02-07 Extension piece to telephone device.

Country Status (4)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1078179B (en) * 1957-02-01 1960-03-24 Draegerwerk Ag Microphone for gas masks

Also Published As

Publication number Publication date
BE440889A (en)
DE737071C (en) 1943-07-05
FR871481A (en) 1942-04-27

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