FR669009A - Improvements to automatic telephone systems - Google Patents

Improvements to automatic telephone systems

Info

Publication number
FR669009A
FR669009A FR669009DA FR669009A FR 669009 A FR669009 A FR 669009A FR 669009D A FR669009D A FR 669009DA FR 669009 A FR669009 A FR 669009A
Authority
FR
France
Prior art keywords
telephone systems
automatic telephone
automatic
systems
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
Application number
Other languages
French (fr)
Inventor
Giulio Mammoli
Luigi Marchi
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 filed Critical
Application granted granted Critical
Publication of FR669009A publication Critical patent/FR669009A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
    • H04Q5/02—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange with direct connection for all subscribers, i.e. party-line systems
    • H04Q5/14—Signalling by pulses
    • H04Q5/16—Signalling by pulses by predetermined number of pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
FR669009D 1928-01-29 1929-01-18 Improvements to automatic telephone systems Expired FR669009A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT669009X 1928-01-29

Publications (1)

Publication Number Publication Date
FR669009A true FR669009A (en) 1929-11-09

Family

ID=1543439

Family Applications (1)

Application Number Title Priority Date Filing Date
FR669009D Expired FR669009A (en) 1928-01-29 1929-01-18 Improvements to automatic telephone systems

Country Status (1)

Country Link
FR (1) FR669009A (en)

Similar Documents

Publication Publication Date Title
FR671055A (en) Improvements to telephone systems
FR37802E (en) Improvements to telephone systems
FR683358A (en) Improvements to automatic telephone systems
FR680025A (en) Improvements to telephone systems
FR687017A (en) Improvements to automatic or semi-automatic telephone systems
FR669009A (en) Improvements to automatic telephone systems
FR667328A (en) Improvements to automatic telephone systems
FR696558A (en) Improvements to telephone systems
FR688272A (en) Improvements to automatic lubrication systems
FR620351A (en) Improvements to automatic telephone systems
FR664485A (en) Improvements to automatic telephone systems
FR686571A (en) Improvements to automatic telephone systems
FR673623A (en) Improvements to automatic telephone systems
FR655645A (en) Improvements to automatic telephone systems
FR671532A (en) Improvements to automatic telephone systems
FR694716A (en) Improvements to telephone systems
FR707755A (en) Improvements to automatic telephone systems
FR708703A (en) Improvements to automatic telephone systems
FR707756A (en) Improvements to automatic telephone systems
FR708668A (en) Improvements to automatic telephone systems
FR684375A (en) Improvements to telephone systems
FR646243A (en) Improvements to automatic telephone systems
FR655242A (en) Improvements to automatic telephone systems
FR693979A (en) Improvements to automatic telephone systems
FR720315A (en) Improvements to automatic telephone systems