NL66226C - - Google Patents

Info

Publication number
NL66226C
NL66226C NL66226DA NL66226C NL 66226 C NL66226 C NL 66226C NL 66226D A NL66226D A NL 66226DA NL 66226 C NL66226 C NL 66226C
Authority
NL
Netherlands
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 NL66226C publication Critical patent/NL66226C/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
    • H04M11/025—Door telephones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
NL66226D 1942-03-12 NL66226C (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US434339A US2345046A (en) 1942-03-12 1942-03-12 Intercommunicating system

Publications (1)

Publication Number Publication Date
NL66226C true NL66226C (sv)

Family

ID=23723823

Family Applications (1)

Application Number Title Priority Date Filing Date
NL66226D NL66226C (sv) 1942-03-12

Country Status (4)

Country Link
US (1) US2345046A (sv)
BE (1) BE467440A (sv)
FR (1) FR938320A (sv)
NL (1) NL66226C (sv)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB597170A (en) * 1945-03-29 1948-01-20 Philips Nv Improvements in loud-speaking telephone arrangements

Also Published As

Publication number Publication date
FR938320A (fr) 1948-09-10
US2345046A (en) 1944-03-28
BE467440A (sv)

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