FR658561A - Improvements to electro-magnetic devices intended for reproducing or sound recording devices - Google Patents

Improvements to electro-magnetic devices intended for reproducing or sound recording devices

Info

Publication number
FR658561A
FR658561A FR658561DA FR658561A FR 658561 A FR658561 A FR 658561A FR 658561D A FR658561D A FR 658561DA FR 658561 A FR658561 A FR 658561A
Authority
FR
France
Prior art keywords
reproducing
electro
sound recording
devices
intended
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.)
COLUMBIA GRAPHOPHONE CO Ltd
Original Assignee
COLUMBIA GRAPHOPHONE CO Ltd
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 COLUMBIA GRAPHOPHONE CO Ltd filed Critical COLUMBIA GRAPHOPHONE CO Ltd
Application granted granted Critical
Publication of FR658561A publication Critical patent/FR658561A/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
    • H04R11/00—Transducers of moving-armature or moving-core type
FR658561D 1927-08-17 1928-08-03 Improvements to electro-magnetic devices intended for reproducing or sound recording devices Expired FR658561A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB21687/27A GB300679A (en) 1927-08-17 1927-08-17 Improvements in or relating to electro-magnetic devices for use in sound reproducingor recording devices

Publications (1)

Publication Number Publication Date
FR658561A true FR658561A (en) 1929-06-06

Family

ID=10167136

Family Applications (1)

Application Number Title Priority Date Filing Date
FR658561D Expired FR658561A (en) 1927-08-17 1928-08-03 Improvements to electro-magnetic devices intended for reproducing or sound recording devices

Country Status (3)

Country Link
US (1) US1889000A (en)
FR (1) FR658561A (en)
GB (1) GB300679A (en)

Also Published As

Publication number Publication date
US1889000A (en) 1932-11-29
GB300679A (en) 1928-11-19

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