FR418019A - Improvements in telephone devices - Google Patents

Improvements in telephone devices

Info

Publication number
FR418019A
FR418019A FR418019DA FR418019A FR 418019 A FR418019 A FR 418019A FR 418019D A FR418019D A FR 418019DA FR 418019 A FR418019 A FR 418019A
Authority
FR
France
Prior art keywords
telephone devices
telephone
devices
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
Edward Alfred Graham
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.)
ALFRED GRAHAM AND C
Original Assignee
ALFRED GRAHAM AND C
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 ALFRED GRAHAM AND C filed Critical ALFRED GRAHAM AND C
Application granted granted Critical
Publication of FR418019A publication Critical patent/FR418019A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR418019D 1910-07-07 1910-07-07 Improvements in telephone devices Expired FR418019A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR418019T 1910-07-07

Publications (1)

Publication Number Publication Date
FR418019A true FR418019A (en) 1910-11-29

Family

ID=1461376

Family Applications (1)

Application Number Title Priority Date Filing Date
FR418019D Expired FR418019A (en) 1910-07-07 1910-07-07 Improvements in telephone devices

Country Status (1)

Country Link
FR (1) FR418019A (en)

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