FR371113A - Sound amplifier for megaphone, acoustic tubes, telephones, etc. - Google Patents

Sound amplifier for megaphone, acoustic tubes, telephones, etc.

Info

Publication number
FR371113A
FR371113A FR371113DA FR371113A FR 371113 A FR371113 A FR 371113A FR 371113D A FR371113D A FR 371113DA FR 371113 A FR371113 A FR 371113A
Authority
FR
France
Prior art keywords
megaphone
telephones
sound amplifier
acoustic tubes
acoustic
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
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.)
"L'ASPIRATOR"
Original Assignee
"L'ASPIRATOR"
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 "L'ASPIRATOR" filed Critical "L'ASPIRATOR"
Application granted granted Critical
Publication of FR371113A publication Critical patent/FR371113A/en
Expired legal-status Critical Current

Links

FR371113D 1906-11-05 1906-11-05 Sound amplifier for megaphone, acoustic tubes, telephones, etc. Expired FR371113A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR371113T 1906-11-05

Publications (1)

Publication Number Publication Date
FR371113A true FR371113A (en) 1907-02-27

Family

ID=43349327

Family Applications (1)

Application Number Title Priority Date Filing Date
FR371113D Expired FR371113A (en) 1906-11-05 1906-11-05 Sound amplifier for megaphone, acoustic tubes, telephones, etc.

Country Status (1)

Country Link
FR (1) FR371113A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012070A1 (en) * 1978-11-24 1980-06-11 Bertin & Cie Pneumatic speaker with constant fluid flow

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012070A1 (en) * 1978-11-24 1980-06-11 Bertin & Cie Pneumatic speaker with constant fluid flow
FR2442565A1 (en) * 1978-11-24 1980-06-20 Bertin & Cie METHOD OF FLUID ACOUSTIC AMPLIFICATION AND PNEUMATIC SPEAKER FOR IMPLEMENTING THE SAME

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