FR71499E - Casque de protection contre le bruit permettant la communication téléphonique - Google Patents

Casque de protection contre le bruit permettant la communication téléphonique

Info

Publication number
FR71499E
FR71499E FR71499DA FR71499E FR 71499 E FR71499 E FR 71499E FR 71499D A FR71499D A FR 71499DA FR 71499 E FR71499 E FR 71499E
Authority
FR
France
Prior art keywords
telephone communication
noise protection
protection helmet
helmet
noise
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)
Inventor
Pierre Lienard
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.)
Office National dEtudes et de Recherches Aerospatiales ONERA
Original Assignee
Office National dEtudes et de Recherches Aerospatiales ONERA
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 Office National dEtudes et de Recherches Aerospatiales ONERA filed Critical Office National dEtudes et de Recherches Aerospatiales ONERA
Application granted granted Critical
Publication of FR71499E publication Critical patent/FR71499E/fr
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR71499D 1950-03-11 1957-05-03 Casque de protection contre le bruit permettant la communication téléphonique Expired FR71499E (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1014280T 1950-03-11

Publications (1)

Publication Number Publication Date
FR71499E true FR71499E (fr) 1960-01-05

Family

ID=9572227

Family Applications (2)

Application Number Title Priority Date Filing Date
FR1014280D Expired FR1014280A (fr) 1950-03-11 1950-03-11 Casque de protection contre le bruit permettant la communication téléphonique
FR71499D Expired FR71499E (fr) 1950-03-11 1957-05-03 Casque de protection contre le bruit permettant la communication téléphonique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR1014280D Expired FR1014280A (fr) 1950-03-11 1950-03-11 Casque de protection contre le bruit permettant la communication téléphonique

Country Status (1)

Country Link
FR (2) FR1014280A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2684067A (en) * 1951-05-19 1954-07-20 Onera (Off Nat Aerospatiale) Soundproof shield
DE952359C (de) * 1953-02-13 1956-11-15 Sued Atlas Werke G M B H Gehaeuse aus Weichgummi fuer Schallgeraete, insbesondere Kristallmikrophone

Also Published As

Publication number Publication date
FR1014280A (fr) 1952-08-12

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