FR451409A - Improvements to telephone devices - Google Patents

Improvements to telephone devices

Info

Publication number
FR451409A
FR451409A FR451409A FR451409DA FR451409A FR 451409 A FR451409 A FR 451409A FR 451409 A FR451409 A FR 451409A FR 451409D A FR451409D A FR 451409DA FR 451409 A FR451409 A FR 451409A
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
FR451409A
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.)
Commercial Wireless & Dev C
Original Assignee
Commercial Wireless & Dev 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 Commercial Wireless & Dev C filed Critical Commercial Wireless & Dev C
Application granted granted Critical
Publication of FR451409A publication Critical patent/FR451409A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
FR451409A 1912-11-11 1912-11-16 Improvements to telephone devices Expired FR451409A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191225896T 1912-11-11

Publications (1)

Publication Number Publication Date
FR451409A true FR451409A (en) 1913-04-18

Family

ID=32574764

Family Applications (1)

Application Number Title Priority Date Filing Date
FR451409A Expired FR451409A (en) 1912-11-11 1912-11-16 Improvements to telephone devices

Country Status (2)

Country Link
FR (1) FR451409A (en)
GB (1) GB191225896A (en)

Also Published As

Publication number Publication date
GB191225896A (en) 1913-04-03

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