NL72721C - - Google Patents

Info

Publication number
NL72721C
NL72721C NL72721DA NL72721C NL 72721 C NL72721 C NL 72721C NL 72721D A NL72721D A NL 72721DA NL 72721 C NL72721 C NL 72721C
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 NL72721C publication Critical patent/NL72721C/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
NL72721D 1938-12-01 NL72721C (enrdf_load_html_response)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US243347A US2208765A (en) 1938-12-01 1938-12-01 Telephone system

Publications (1)

Publication Number Publication Date
NL72721C true NL72721C (enrdf_load_html_response)

Family

ID=22918388

Family Applications (2)

Application Number Title Priority Date Filing Date
NL70515D NL70515C (enrdf_load_html_response) 1938-12-01
NL72721D NL72721C (enrdf_load_html_response) 1938-12-01

Family Applications Before (1)

Application Number Title Priority Date Filing Date
NL70515D NL70515C (enrdf_load_html_response) 1938-12-01

Country Status (6)

Country Link
US (3) US2208765A (enrdf_load_html_response)
BE (1) BE476596A (enrdf_load_html_response)
CH (2) CH276283A (enrdf_load_html_response)
FR (2) FR1031552A (enrdf_load_html_response)
GB (2) GB640033A (enrdf_load_html_response)
NL (2) NL72721C (enrdf_load_html_response)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2586901A (en) * 1948-07-24 1952-02-26 Bell Telephone Labor Inc Two-way trunk circuit arranged for dial-back operations
US2691068A (en) * 1950-12-11 1954-10-05 Stromberg Carlson Co Two-way carrier type trunk circuit
US2715158A (en) * 1951-10-31 1955-08-09 Stromberg Carlson Co Signaling system
US2708692A (en) * 1952-06-14 1955-05-17 Automatic Elect Lab Toll switching telephone systems
US2726285A (en) * 1952-09-06 1955-12-06 Gen Dynamics Corp Dial cord circuit
US2769862A (en) * 1953-02-06 1956-11-06 Gen Dynamics Corp Convertible interoffice trunk

Also Published As

Publication number Publication date
BE476596A (enrdf_load_html_response)
CH276283A (fr) 1951-06-30
NL70515C (enrdf_load_html_response)
GB640032A (en) 1950-07-12
CH286287A (fr) 1952-10-15
USRE22440E (en) 1944-02-22
USRE22441E (en) 1944-02-22
FR951758A (fr) 1949-11-03
US2208765A (en) 1940-07-23
GB640033A (en) 1950-07-12
FR1031552A (fr) 1953-06-24

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