FR642703A - Improvement in telephone receivers - Google Patents

Improvement in telephone receivers

Info

Publication number
FR642703A
FR642703A FR642703DA FR642703A FR 642703 A FR642703 A FR 642703A FR 642703D A FR642703D A FR 642703DA FR 642703 A FR642703 A FR 642703A
Authority
FR
France
Prior art keywords
improvement
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
Andre Falco
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 FR642703A publication Critical patent/FR642703A/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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for telephonic receivers

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR642703D 1927-03-24 1927-03-24 Improvement in telephone receivers Expired FR642703A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR642703T 1927-03-24

Publications (1)

Publication Number Publication Date
FR642703A true FR642703A (en) 1928-09-03

Family

ID=8998973

Family Applications (1)

Application Number Title Priority Date Filing Date
FR642703D Expired FR642703A (en) 1927-03-24 1927-03-24 Improvement in telephone receivers

Country Status (1)

Country Link
FR (1) FR642703A (en)

Similar Documents

Publication Publication Date Title
FR640689A (en) Improvements in radio-telehraphic communications
FR653988A (en) Improvements in radiotelephone communications
FR642703A (en) Improvement in telephone receivers
FR640482A (en) Improvement in telephone receivers
FR640529A (en) Improvement in telephone receivers
FR575307A (en) Improvement in jockstrap
FR595982A (en) Improvement in automatic scales
FR669255A (en) Filter refinements
FR668273A (en) Improvement in electro-acoustic devices
FR606937A (en) Improvement in chimneys
FR676675A (en) Improvement in telephone receivers
FR627596A (en) Improvement in mudguards
FR662403A (en) Garters improvement
FR641201A (en) Improvements to telephone receivers
FR641542A (en) Improvement in telephone membranes
FR649209A (en) Corkscrew refinements
FR581855A (en) Improvement in self-inductions
FR604660A (en) Improvements to telephone receivers
FR616794A (en) Improvement in superheterodyne receptors
FR680562A (en) Improvement in box-packaging
FR677356A (en) Improvement in norias
FR665164A (en) Improvement in aerocalorifers
FR605094A (en) Improvement in churn-mixers
FR650929A (en) Improvement in gasifiers
FR637267A (en) Improvement in churn-mixers