FR412922A - Telephone transmitter - Google Patents

Telephone transmitter

Info

Publication number
FR412922A
FR412922A FR412922A FR412922DA FR412922A FR 412922 A FR412922 A FR 412922A FR 412922 A FR412922 A FR 412922A FR 412922D A FR412922D A FR 412922DA FR 412922 A FR412922 A FR 412922A
Authority
FR
France
Prior art keywords
telephone transmitter
telephone
transmitter
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
FR412922A
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.)
SANITARY TELEPHONE TRANSMITTER
Original Assignee
SANITARY TELEPHONE TRANSMITTER
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 SANITARY TELEPHONE TRANSMITTER filed Critical SANITARY TELEPHONE TRANSMITTER
Application granted granted Critical
Publication of FR412922A publication Critical patent/FR412922A/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)
  • Telephone Set Structure (AREA)
  • Transducers For Ultrasonic Waves (AREA)
FR412922A 1910-02-22 1910-02-22 Telephone transmitter Expired FR412922A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191004446T 1910-02-22

Publications (1)

Publication Number Publication Date
FR412922A true FR412922A (en) 1910-07-27

Family

ID=32491460

Family Applications (1)

Application Number Title Priority Date Filing Date
FR412922A Expired FR412922A (en) 1910-02-22 1910-02-22 Telephone transmitter

Country Status (3)

Country Link
DE (1) DE230935C (en)
FR (1) FR412922A (en)
GB (1) GB191004446A (en)

Also Published As

Publication number Publication date
DE230935C (en)
GB191004446A (en) 1910-05-26

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