DE568139C - Schalldicht abschliessende Telefoneinsprache - Google Patents

Schalldicht abschliessende Telefoneinsprache

Info

Publication number
DE568139C
DE568139C DEN31436D DEN0031436D DE568139C DE 568139 C DE568139 C DE 568139C DE N31436 D DEN31436 D DE N31436D DE N0031436 D DEN0031436 D DE N0031436D DE 568139 C DE568139 C DE 568139C
Authority
DE
Germany
Prior art keywords
soundproof
telephone call
background noise
final telephone
final
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
DEN31436D
Other languages
German (de)
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.)
MAX NAUMANN DR
Original Assignee
MAX NAUMANN DR
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
Priority to BE403504D priority Critical patent/BE403504A/xx
Application filed by MAX NAUMANN DR filed Critical MAX NAUMANN DR
Priority to DEN31436D priority patent/DE568139C/de
Application granted granted Critical
Publication of DE568139C publication Critical patent/DE568139C/de
Priority to DEN36487D priority patent/DE625198C/de
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/02Constructional features of telephone sets
    • H04M1/19Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
DEN31436D 1931-01-20 1931-01-20 Schalldicht abschliessende Telefoneinsprache Expired DE568139C (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE403504D BE403504A (da) 1931-01-20
DEN31436D DE568139C (de) 1931-01-20 1931-01-20 Schalldicht abschliessende Telefoneinsprache
DEN36487D DE625198C (de) 1931-01-20 1934-03-20 Schalldicht abschliessende Telephoneinsprache

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN31436D DE568139C (de) 1931-01-20 1931-01-20 Schalldicht abschliessende Telefoneinsprache

Publications (1)

Publication Number Publication Date
DE568139C true DE568139C (de) 1933-01-14

Family

ID=7345965

Family Applications (1)

Application Number Title Priority Date Filing Date
DEN31436D Expired DE568139C (de) 1931-01-20 1931-01-20 Schalldicht abschliessende Telefoneinsprache

Country Status (2)

Country Link
BE (1) BE403504A (da)
DE (1) DE568139C (da)

Also Published As

Publication number Publication date
BE403504A (da)

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