FR330692A - Improvements to telephone devices - Google Patents

Improvements to telephone devices

Info

Publication number
FR330692A
FR330692A FR330692DA FR330692A FR 330692 A FR330692 A FR 330692A FR 330692D A FR330692D A FR 330692DA FR 330692 A FR330692 A FR 330692A
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
Sidney George Brown
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR330692A publication Critical patent/FR330692A/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)
FR330692D 1903-03-28 1903-03-28 Improvements to telephone devices Expired FR330692A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR330692T 1903-03-28

Publications (1)

Publication Number Publication Date
FR330692A true FR330692A (en) 1903-08-24

Family

ID=1380451

Family Applications (1)

Application Number Title Priority Date Filing Date
FR330692D Expired FR330692A (en) 1903-03-28 1903-03-28 Improvements to telephone devices

Country Status (1)

Country Link
FR (1) FR330692A (en)

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