FR401442A - Sound amplifier telephone transmitter - Google Patents

Sound amplifier telephone transmitter

Info

Publication number
FR401442A
FR401442A FR401442DA FR401442A FR 401442 A FR401442 A FR 401442A FR 401442D A FR401442D A FR 401442DA FR 401442 A FR401442 A FR 401442A
Authority
FR
France
Prior art keywords
sound amplifier
telephone transmitter
telephone
transmitter
amplifier
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
Emmanuel-Rene-Marie Laime
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.)
EMMANUEL RENE MARIE LAIME
Original Assignee
EMMANUEL RENE MARIE LAIME
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 EMMANUEL RENE MARIE LAIME filed Critical EMMANUEL RENE MARIE LAIME
Application granted granted Critical
Publication of FR401442A publication Critical patent/FR401442A/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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR401442D 1909-03-31 1909-03-31 Sound amplifier telephone transmitter Expired FR401442A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR401442T 1909-03-31

Publications (1)

Publication Number Publication Date
FR401442A true FR401442A (en) 1909-08-28

Family

ID=1446243

Family Applications (1)

Application Number Title Priority Date Filing Date
FR401442D Expired FR401442A (en) 1909-03-31 1909-03-31 Sound amplifier telephone transmitter

Country Status (1)

Country Link
FR (1) FR401442A (en)

Similar Documents

Publication Publication Date Title
FR401442A (en) Sound amplifier telephone transmitter
FR423980A (en) Telephone transmitters
FR371113A (en) Sound amplifier for megaphone, acoustic tubes, telephones, etc.
FR400082A (en) Secret telephone transmitter
FR405608A (en) Telephone transmitters
CA124423A (en) Sound amplifier
FR377966A (en) Telephone transmitter
CA115776A (en) Sound reproducer
FR424163A (en) Improvements to the mouths of telephone transmitters
FR417729A (en) Sound reproduction machine
DK11426C (en) Electric Sound Amplifier.
FR406313A (en) Sound reproduction machines
FR5890E (en) Telephone microphone and receiver
CA93617A (en) Sound reproducer
FR393541A (en) Telephone receiver
CA108417A (en) Sound signal
FR377472A (en) Telephone transmitter
FR416171A (en) Microphone
CH48526A (en) Microphone
CA118863A (en) Bell ringer
CA118893A (en) Bell ringer
CA124067A (en) Bell ringer
ES48511A3 (en) Improvements in the construction of speakers or sound amplifiers.
CA128441A (en) Sound record
CA103963A (en) Bell