FR556237A - Improvements in signaling systems - Google Patents

Improvements in signaling systems

Info

Publication number
FR556237A
FR556237A FR556237DA FR556237A FR 556237 A FR556237 A FR 556237A FR 556237D A FR556237D A FR 556237DA FR 556237 A FR556237 A FR 556237A
Authority
FR
France
Prior art keywords
signaling systems
signaling
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR556237A publication Critical patent/FR556237A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
FR556237D 1921-09-20 1922-09-18 Improvements in signaling systems Expired FR556237A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US501974A US1519477A (en) 1921-09-20 1921-09-20 Signaling system

Publications (1)

Publication Number Publication Date
FR556237A true FR556237A (en) 1923-07-13

Family

ID=23995781

Family Applications (1)

Application Number Title Priority Date Filing Date
FR556237D Expired FR556237A (en) 1921-09-20 1922-09-18 Improvements in signaling systems

Country Status (3)

Country Link
US (1) US1519477A (en)
FR (1) FR556237A (en)
GB (1) GB186333A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2791972A (en) * 1951-10-15 1957-05-14 Gilbert Co A C Vibrator excited loud speaker for toys

Also Published As

Publication number Publication date
GB186333A (en) 1923-07-26
US1519477A (en) 1924-12-16

Similar Documents

Publication Publication Date Title
FR556237A (en) Improvements in signaling systems
FR27226E (en) Improvements in signaling systems
FR570610A (en) Improvements in telegraph systems
FR525549A (en) Improvements in multiplex signaling systems
FR576661A (en) Improvements in electrical signaling systems
FR595750A (en) Improvements in signaling systems
FR573015A (en) Improvements in electrical signaling systems
FR576684A (en) Improvements in electrical multiplex signaling systems
FR563306A (en) Improvements to signaling systems
FR655685A (en) Improvements to electrical signaling systems
FR606311A (en) Improvements to signaling systems
FR520838A (en) Improvements in signaling devices
FR569831A (en) Improvements in signaling devices for automobiles
FR570943A (en) Improvements to electrical signaling systems
FR540815A (en) Improvements to signaling systems
FR603785A (en) Improvements to signaling systems
FR35156E (en) Improvements to signaling systems
FR36652E (en) Improvements to signaling systems
FR31534E (en) Improvements to signaling systems
FR609016A (en) Improvements to power line signaling systems
FR590231A (en) Improvements to signaling systems
FR557719A (en) Improvements in refrigeration systems
FR568339A (en) Improvements in telephone systems
FR659709A (en) Improvements to signaling systems
FR637456A (en) Improvements to signaling systems