FR700644A - Improvements to electro-acoustic devices such as loudspeakers - Google Patents

Improvements to electro-acoustic devices such as loudspeakers

Info

Publication number
FR700644A
FR700644A FR700644DA FR700644A FR 700644 A FR700644 A FR 700644A FR 700644D A FR700644D A FR 700644DA FR 700644 A FR700644 A FR 700644A
Authority
FR
France
Prior art keywords
loudspeakers
electro
acoustic devices
acoustic
devices
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.)
Electrical Research Products Inc
Original Assignee
Electrical Research Products Inc
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 Electrical Research Products Inc filed Critical Electrical Research Products Inc
Application granted granted Critical
Publication of FR700644A publication Critical patent/FR700644A/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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
FR700644D 1929-08-17 1930-08-14 Improvements to electro-acoustic devices such as loudspeakers Expired FR700644A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US360030XA 1929-08-17 1929-08-17

Publications (1)

Publication Number Publication Date
FR700644A true FR700644A (en) 1931-03-05

Family

ID=21886041

Family Applications (1)

Application Number Title Priority Date Filing Date
FR700644D Expired FR700644A (en) 1929-08-17 1930-08-14 Improvements to electro-acoustic devices such as loudspeakers

Country Status (2)

Country Link
FR (1) FR700644A (en)
GB (1) GB360030A (en)

Also Published As

Publication number Publication date
GB360030A (en) 1931-11-02

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