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FR660479A - Perfectionnements aux microtéléphones - Google Patents

Perfectionnements aux microtéléphones

Info

Publication number
FR660479A
FR660479A FR660479DA FR660479A FR 660479 A FR660479 A FR 660479A FR 660479D A FR660479D A FR 660479DA FR 660479 A FR660479 A FR 660479A
Authority
FR
France
Prior art keywords
microtelephones
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
English (en)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR660479A publication Critical patent/FR660479A/fr
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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Telephone Set Structure (AREA)
FR660479D 1927-10-31 1928-09-15 Perfectionnements aux microtéléphones Expired FR660479A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB28960/27A GB304843A (en) 1927-10-31 1927-10-31 Improvements in or relating to telephone hand sets

Publications (1)

Publication Number Publication Date
FR660479A true FR660479A (fr) 1929-07-11

Family

ID=10283971

Family Applications (1)

Application Number Title Priority Date Filing Date
FR660479D Expired FR660479A (fr) 1927-10-31 1928-09-15 Perfectionnements aux microtéléphones

Country Status (4)

Country Link
US (1) US1779490A (fr)
FR (1) FR660479A (fr)
GB (1) GB304843A (fr)
NL (1) NL25706C (fr)

Also Published As

Publication number Publication date
US1779490A (en) 1930-10-28
GB304843A (en) 1929-01-31
NL25706C (fr)

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