FR517394A - Phone enhancements - Google Patents

Phone enhancements

Info

Publication number
FR517394A
FR517394A FR517394DA FR517394A FR 517394 A FR517394 A FR 517394A FR 517394D A FR517394D A FR 517394DA FR 517394 A FR517394 A FR 517394A
Authority
FR
France
Prior art keywords
enhancements
phone
phone enhancements
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.)
Telephone Manufacturing Co Ltd
Original Assignee
Telephone Manufacturing Co Ltd
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 Telephone Manufacturing Co Ltd filed Critical Telephone Manufacturing Co Ltd
Application granted granted Critical
Publication of FR517394A publication Critical patent/FR517394A/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)
  • Headphones And Earphones (AREA)
FR517394D 1919-06-18 1920-06-17 Phone enhancements Expired FR517394A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1535219A GB151336A (en) 1919-06-18 1919-06-18 Improvements in or relating to telephones

Publications (1)

Publication Number Publication Date
FR517394A true FR517394A (en) 1921-05-04

Family

ID=10057617

Family Applications (1)

Application Number Title Priority Date Filing Date
FR517394D Expired FR517394A (en) 1919-06-18 1920-06-17 Phone enhancements

Country Status (2)

Country Link
FR (1) FR517394A (en)
GB (1) GB151336A (en)

Also Published As

Publication number Publication date
GB151336A (en) 1920-09-20

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