FR37802E - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR37802E
FR37802E FR37802DA FR37802E FR 37802 E FR37802 E FR 37802E FR 37802D A FR37802D A FR 37802DA FR 37802 E FR37802 E FR 37802E
Authority
FR
France
Prior art keywords
telephone systems
telephone
systems
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
Other languages
French (fr)
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.)
Associated Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph Co
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
Application filed by Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Application granted granted Critical
Publication of FR37802E publication Critical patent/FR37802E/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
FR37802D 1928-12-10 1929-12-10 Improvements to telephone systems Expired FR37802E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US324816A US1799485A (en) 1928-12-10 1928-12-10 Telephone system

Publications (1)

Publication Number Publication Date
FR37802E true FR37802E (en) 1931-01-24

Family

ID=23265223

Family Applications (1)

Application Number Title Priority Date Filing Date
FR37802D Expired FR37802E (en) 1928-12-10 1929-12-10 Improvements to telephone systems

Country Status (3)

Country Link
US (1) US1799485A (en)
FR (1) FR37802E (en)
GB (1) GB344362A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB575294A (en) * 1944-01-12 1946-02-12 Automatic Telephone & Elect Improvements in or relating to telephone systems
BE478817A (en) * 1947-01-07
US2898407A (en) * 1957-06-05 1959-08-04 Gen Dynamics Corp Electronic telephone system
US3228003A (en) * 1962-03-20 1966-01-04 Ibm Matrix search device

Also Published As

Publication number Publication date
US1799485A (en) 1931-04-07
GB344362A (en) 1931-03-03

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