CH100987A - Chapeau de concentration pour instrument acoustique. - Google Patents

Chapeau de concentration pour instrument acoustique.

Info

Publication number
CH100987A
CH100987A CH100987DA CH100987A CH 100987 A CH100987 A CH 100987A CH 100987D A CH100987D A CH 100987DA CH 100987 A CH100987 A CH 100987A
Authority
CH
Switzerland
Prior art keywords
acoustic instrument
hat
concentration
concentration hat
acoustic
Prior art date
Application number
Other languages
English (en)
Inventor
Marr Alexander
Original Assignee
Marr Alexander
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 Marr Alexander filed Critical Marr Alexander
Publication of CH100987A publication Critical patent/CH100987A/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
CH100987D 1921-05-26 1922-05-22 Chapeau de concentration pour instrument acoustique. CH100987A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB551937X 1921-05-26

Publications (1)

Publication Number Publication Date
CH100987A true CH100987A (fr) 1923-09-01

Family

ID=10473235

Family Applications (1)

Application Number Title Priority Date Filing Date
CH100987D CH100987A (fr) 1921-05-26 1922-05-22 Chapeau de concentration pour instrument acoustique.

Country Status (2)

Country Link
CH (1) CH100987A (fr)
FR (1) FR551937A (fr)

Also Published As

Publication number Publication date
FR551937A (fr) 1923-04-17

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