FR330882A - Perfectionnements aux systèmes téléphoniques - Google Patents

Perfectionnements aux systèmes téléphoniques

Info

Publication number
FR330882A
FR330882A FR330882DA FR330882A FR 330882 A FR330882 A FR 330882A FR 330882D A FR330882D A FR 330882DA FR 330882 A FR330882 A FR 330882A
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
English (en)
Inventor
Thomas Paul
John L.-Macdougall
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.)
JOHN L MACDOUGALL
Original Assignee
JOHN L MACDOUGALL
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 JOHN L MACDOUGALL filed Critical JOHN L MACDOUGALL
Application granted granted Critical
Publication of FR330882A publication Critical patent/FR330882A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M5/00—Manual exchanges
    • H04M5/12—Calling substations, e.g. by ringing

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR330882D 1903-04-03 1903-04-03 Perfectionnements aux systèmes téléphoniques Expired FR330882A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR330882T 1903-04-03

Publications (1)

Publication Number Publication Date
FR330882A true FR330882A (fr) 1903-08-26

Family

ID=1380632

Family Applications (1)

Application Number Title Priority Date Filing Date
FR330882D Expired FR330882A (fr) 1903-04-03 1903-04-03 Perfectionnements aux systèmes téléphoniques

Country Status (1)

Country Link
FR (1) FR330882A (fr)

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