US2320549A - Telephone system - Google Patents

Telephone system Download PDF

Info

Publication number
US2320549A
US2320549A US396238A US39623841A US2320549A US 2320549 A US2320549 A US 2320549A US 396238 A US396238 A US 396238A US 39623841 A US39623841 A US 39623841A US 2320549 A US2320549 A US 2320549A
Authority
US
United States
Prior art keywords
telephone system
telephone
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 - Lifetime
Application number
US396238A
Inventor
John H Voss
Kessler Frank
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 Electric Laboratories Inc
Original Assignee
Associated Electric Laboratories Inc
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 Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Priority to US396238A priority Critical patent/US2320549A/en
Application granted granted Critical
Publication of US2320549A publication Critical patent/US2320549A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
US396238A 1941-05-31 1941-05-31 Telephone system Expired - Lifetime US2320549A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US396238A US2320549A (en) 1941-05-31 1941-05-31 Telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US396238A US2320549A (en) 1941-05-31 1941-05-31 Telephone system

Publications (1)

Publication Number Publication Date
US2320549A true US2320549A (en) 1943-06-01

Family

ID=23566426

Family Applications (1)

Application Number Title Priority Date Filing Date
US396238A Expired - Lifetime US2320549A (en) 1941-05-31 1941-05-31 Telephone system

Country Status (1)

Country Link
US (1) US2320549A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813153A (en) * 1953-08-11 1957-11-12 Gen Dynamics Corp Intertoll trunk circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813153A (en) * 1953-08-11 1957-11-12 Gen Dynamics Corp Intertoll trunk circuit

Similar Documents

Publication Publication Date Title
US2333445A (en) Hydroxyaminobenzenesulphonamides
US2320549A (en) Telephone system
US2320548A (en) Telephone system
CA394870A (en) Telephone system
CA397941A (en) Telephone system
CA400158A (en) Telephone system
CA394866A (en) Telephone system
CA398256A (en) Telephone system
CA398253A (en) Telephone system
CA398569A (en) Telephone system
CA398988A (en) Telephone system
CA399233A (en) Telephone system
CA399232A (en) Telephone system
CA398255A (en) Telephone system
CA401611A (en) Telephone system
CA401008A (en) Telephone system
CA399805A (en) Telephone system
CA398184A (en) Telephone system
CA399518A (en) Telephone system
CA399200A (en) Telephone system
CA396070A (en) Telephone signalling system
CA398251A (en) Telephone set
CA397168A (en) Dial telephone system
CA395654A (en) Communication system
CA395655A (en) Communication system