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FR670622A - Improvements to telephone receivers - Google Patents

Improvements to telephone receivers

Info

Publication number
FR670622A
FR670622A FR670622DA FR670622A FR 670622 A FR670622 A FR 670622A FR 670622D A FR670622D A FR 670622DA FR 670622 A FR670622 A FR 670622A
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)
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.)
RUDOLPH KRUGER TELEGRAPHEN BAU
Original Assignee
RUDOLPH KRUGER TELEGRAPHEN BAU
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 RUDOLPH KRUGER TELEGRAPHEN BAU filed Critical RUDOLPH KRUGER TELEGRAPHEN BAU
Application granted granted Critical
Publication of FR670622A publication Critical patent/FR670622A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication
    • H04R5/0335—Earpiece support, e.g. headbands or neckrests

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR670622D 1928-03-01 1929-02-28 Improvements to telephone receivers Expired FR670622A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE670622X 1928-03-01

Publications (1)

Publication Number Publication Date
FR670622A true FR670622A (en) 1929-12-02

Family

ID=6590377

Family Applications (1)

Application Number Title Priority Date Filing Date
FR670622D Expired FR670622A (en) 1928-03-01 1929-02-28 Improvements to telephone receivers

Country Status (1)

Country Link
FR (1) FR670622A (en)

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