DE190097C - - Google Patents

Info

Publication number
DE190097C
DE190097C DENDAT190097D DE190097DA DE190097C DE 190097 C DE190097 C DE 190097C DE NDAT190097 D DENDAT190097 D DE NDAT190097D DE 190097D A DE190097D A DE 190097DA DE 190097 C DE190097 C DE 190097C
Authority
DE
Germany
Prior art keywords
microphone
button
telephone
lock
inductor
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.)
Active
Application number
DENDAT190097D
Other languages
German (de)
English (en)
Publication of DE190097C publication Critical patent/DE190097C/de
Active 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
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/667—Preventing unauthorised calls from a telephone set

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
DENDAT190097D Active DE190097C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Publications (1)

Publication Number Publication Date
DE190097C true DE190097C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Family

ID=453585

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT190097D Active DE190097C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Country Status (1)

Country Link
DE (1) DE190097C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

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