FR646686A - Improvements to telephones, in particular the speaker type - Google Patents

Improvements to telephones, in particular the speaker type

Info

Publication number
FR646686A
FR646686A FR646686DA FR646686A FR 646686 A FR646686 A FR 646686A FR 646686D A FR646686D A FR 646686DA FR 646686 A FR646686 A FR 646686A
Authority
FR
France
Prior art keywords
telephones
speaker type
speaker
type
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.)
HOPKINS CORP
Original Assignee
HOPKINS CORP
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 HOPKINS CORP filed Critical HOPKINS CORP
Application granted granted Critical
Publication of FR646686A publication Critical patent/FR646686A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnets (AREA)
  • Magnetic Treatment Devices (AREA)
FR646686D 1927-01-07 1928-01-03 Improvements to telephones, in particular the speaker type Expired FR646686A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US159552A US1782094A (en) 1927-01-07 1927-01-07 Electrical movement for loud-speakers

Publications (1)

Publication Number Publication Date
FR646686A true FR646686A (en) 1928-11-14

Family

ID=22573025

Family Applications (1)

Application Number Title Priority Date Filing Date
FR646686D Expired FR646686A (en) 1927-01-07 1928-01-03 Improvements to telephones, in particular the speaker type

Country Status (5)

Country Link
US (1) US1782094A (en)
BE (1) BE347742A (en)
DE (1) DE500413C (en)
FR (1) FR646686A (en)
GB (1) GB283213A (en)

Also Published As

Publication number Publication date
GB283213A (en) 1928-09-20
BE347742A (en)
US1782094A (en) 1930-11-18
DE500413C (en) 1930-06-24

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