BE437345A - - Google Patents

Info

Publication number
BE437345A
BE437345A BE437345DA BE437345A BE 437345 A BE437345 A BE 437345A BE 437345D A BE437345D A BE 437345DA BE 437345 A BE437345 A BE 437345A
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 BE437345A publication Critical patent/BE437345A/xx

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
    • H04M1/67—Preventing unauthorised calls from a telephone set by electronic means

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
BE437345D 1939-12-12 BE437345A (enrdf_load_html_response)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE881670X 1939-12-12

Publications (1)

Publication Number Publication Date
BE437345A true BE437345A (enrdf_load_html_response)

Family

ID=3883816

Family Applications (1)

Application Number Title Priority Date Filing Date
BE437345D BE437345A (enrdf_load_html_response) 1939-12-12

Country Status (2)

Country Link
BE (1) BE437345A (enrdf_load_html_response)
FR (1) FR881670A (enrdf_load_html_response)

Also Published As

Publication number Publication date
FR881670A (fr) 1943-05-05

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