FR591763A - Improvements to telephone receivers - Google Patents

Improvements to telephone receivers

Info

Publication number
FR591763A
FR591763A FR591763DA FR591763A FR 591763 A FR591763 A FR 591763A FR 591763D A FR591763D A FR 591763DA FR 591763 A FR591763 A FR 591763A
Authority
FR
France
Prior art keywords
telephone receivers
receivers
telephone
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)
Inventor
Edward Alfred Graham
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 filed Critical
Application granted granted Critical
Publication of FR591763A publication Critical patent/FR591763A/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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • H04R3/08—Circuits for transducers, loudspeakers or microphones for correcting frequency response of electromagnetic transducers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Push-Button Switches (AREA)
FR591763D 1925-01-19 1925-01-19 Improvements to telephone receivers Expired FR591763A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3388A US1549131A (en) 1925-01-19 1925-01-19 Telephonic receiver

Publications (1)

Publication Number Publication Date
FR591763A true FR591763A (en) 1925-07-17

Family

ID=21705629

Family Applications (1)

Application Number Title Priority Date Filing Date
FR591763D Expired FR591763A (en) 1925-01-19 1925-01-19 Improvements to telephone receivers

Country Status (2)

Country Link
US (1) US1549131A (en)
FR (1) FR591763A (en)

Also Published As

Publication number Publication date
US1549131A (en) 1925-08-11

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