FR328528A - Microphone system for telephone devices - Google Patents

Microphone system for telephone devices

Info

Publication number
FR328528A
FR328528A FR328528A FR328528DA FR328528A FR 328528 A FR328528 A FR 328528A FR 328528 A FR328528 A FR 328528A FR 328528D A FR328528D A FR 328528DA FR 328528 A FR328528 A FR 328528A
Authority
FR
France
Prior art keywords
microphone system
telephone devices
telephone
devices
microphone
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
FR328528A
Other languages
French (fr)
Inventor
Louis-Theophile Bassompierre
Leon-Joseph-Mathurin Dardeau
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.)
LEON-JOSEPH-MATHURIN DARDEAU
LOUIS-THEOPHILE BASSOMPIERRE
Original Assignee
LEON-JOSEPH-MATHURIN DARDEAU
LOUIS-THEOPHILE BASSOMPIERRE
Filing date
Publication date
Application filed by LEON-JOSEPH-MATHURIN DARDEAU, LOUIS-THEOPHILE BASSOMPIERRE filed Critical LEON-JOSEPH-MATHURIN DARDEAU
Application granted granted Critical
Publication of FR328528A publication Critical patent/FR328528A/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
    • 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
    • H04M1/04—Supports for telephone transmitters or receivers
FR328528A 1903-01-15 Microphone system for telephone devices Expired FR328528A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7932T

Publications (1)

Publication Number Publication Date
FR328528A true FR328528A (en) 1903-07-16

Family

ID=8618743

Family Applications (2)

Application Number Title Priority Date Filing Date
FR7932D Active FR7932E (en)
FR328528A Expired FR328528A (en) 1903-01-15 Microphone system for telephone devices

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR7932D Active FR7932E (en)

Country Status (1)

Country Link
FR (2) FR328528A (en)

Also Published As

Publication number Publication date
FR7932E (en)

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