DE221015C - - Google Patents

Info

Publication number
DE221015C
DE221015C DENDAT221015D DE221015DA DE221015C DE 221015 C DE221015 C DE 221015C DE NDAT221015 D DENDAT221015 D DE NDAT221015D DE 221015D A DE221015D A DE 221015DA DE 221015 C DE221015 C DE 221015C
Authority
DE
Germany
Prior art keywords
opening
tube
inner tube
speaking
outer tube
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.)
Active
Application number
DENDAT221015D
Other languages
German (de)
English (en)
Publication of DE221015C publication Critical patent/DE221015C/de
Active legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/22—Methods or devices for transmitting, conducting or directing sound for conducting sound through hollow pipes, e.g. speaking tubes

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Toys (AREA)
DENDAT221015D Active DE221015C (enrdf_load_stackoverflow)

Publications (1)

Publication Number Publication Date
DE221015C true DE221015C (enrdf_load_stackoverflow)

Family

ID=482026

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT221015D Active DE221015C (enrdf_load_stackoverflow)

Country Status (1)

Country Link
DE (1) DE221015C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6542239B1 (en) 1998-07-21 2003-04-01 Institut Fur Chemo Und Biusensorik Munster E.V. Method for testing the functionality of a spectrometer and a spectrometer comprising a fault recognition device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6542239B1 (en) 1998-07-21 2003-04-01 Institut Fur Chemo Und Biusensorik Munster E.V. Method for testing the functionality of a spectrometer and a spectrometer comprising a fault recognition device

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