FR506385A - Microphone - Google Patents

Microphone

Info

Publication number
FR506385A
FR506385A FR506385A FR506385DA FR506385A FR 506385 A FR506385 A FR 506385A FR 506385 A FR506385 A FR 506385A FR 506385D A FR506385D A FR 506385DA FR 506385 A FR506385 A FR 506385A
Authority
FR
France
Prior art keywords
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
FR506385A
Other languages
English (en)
Inventor
Oreste Angelini
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 FR506385A publication Critical patent/FR506385A/fr
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
    • H04R21/023—Microphones with more than one granular chamber

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR506385A 1915-12-02 1919-11-19 Microphone Expired FR506385A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT506385X 1915-12-02

Publications (1)

Publication Number Publication Date
FR506385A true FR506385A (fr) 1920-08-20

Family

ID=11273428

Family Applications (1)

Application Number Title Priority Date Filing Date
FR506385A Expired FR506385A (fr) 1915-12-02 1919-11-19 Microphone

Country Status (1)

Country Link
FR (1) FR506385A (fr)

Similar Documents

Publication Publication Date Title
CH72565A (de) Mikrotelephon
FR480219A (fr) Riveuse
FR480740A (fr) Corset-ceinture
FR506385A (fr) Microphone
FR480089A (fr) Stéréo-classeur
CH71926A (de) Photogrammeter
CH72540A (fr) Joiont
CH73983A (de) Photogrammeter
DK19679C (da) Mikrofon.
AT75554B (de) Mikrophon.
FR478199A (fr) Étuve-séchoir
FR482011A (fr) Block-système
FR512984A (fr) Fixe-jumelle
FR480123A (fr) Patin-chaufferette
FR512128A (fr) Dynamomètre-compteur
FR479484A (fr) Briquet-obus
FR481468A (fr) Plansichter
FR525815A (fr) Commutateur-interrupteur
FR491181A (fr) Télémètre-hausse
FR20906E (fr) Télémètre-hausse
FR20380E (fr) Corset-ceinture
CH75437A (de) Kötzerspulmaschine
CH72564A (de) Selbstverkäufer
FI6145A (fi) Dikesplog
FI6146A (fi) Lådvedbarkningsmaskin