FR450970A - Device for expanding the horns of telephone receivers - Google Patents

Device for expanding the horns of telephone receivers

Info

Publication number
FR450970A
FR450970A FR450970A FR450970DA FR450970A FR 450970 A FR450970 A FR 450970A FR 450970 A FR450970 A FR 450970A FR 450970D A FR450970D A FR 450970DA FR 450970 A FR450970 A FR 450970A
Authority
FR
France
Prior art keywords
horns
expanding
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
FR450970A
Other languages
French (fr)
Inventor
Pierrie Moran Cox
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR450970A publication Critical patent/FR450970A/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1091—Details not provided for in groups H04R1/1008 - H04R1/1083

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
FR450970A 1912-11-18 1912-11-23 Device for expanding the horns of telephone receivers Expired FR450970A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191226474T 1912-11-18

Publications (1)

Publication Number Publication Date
FR450970A true FR450970A (en) 1913-04-08

Family

ID=32575021

Family Applications (1)

Application Number Title Priority Date Filing Date
FR450970A Expired FR450970A (en) 1912-11-18 1912-11-23 Device for expanding the horns of telephone receivers

Country Status (2)

Country Link
FR (1) FR450970A (en)
GB (1) GB191226474A (en)

Also Published As

Publication number Publication date
GB191226474A (en) 1913-03-13

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