FR494654A - Appareil écouteur-isolateur - Google Patents

Appareil écouteur-isolateur

Info

Publication number
FR494654A
FR494654A FR494654A FR494654DA FR494654A FR 494654 A FR494654 A FR 494654A FR 494654 A FR494654 A FR 494654A FR 494654D A FR494654D A FR 494654DA FR 494654 A FR494654 A FR 494654A
Authority
FR
France
Prior art keywords
earphone
isolator device
isolator
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
FR494654A
Other languages
English (en)
Inventor
Andre Bloch
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
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of FR494654A publication Critical patent/FR494654A/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
    • H04M1/04—Supports for telephone transmitters or receivers
    • H04M1/05—Supports for telephone transmitters or receivers specially adapted for use on head, throat or breast
FR494654A 1917-04-20 Appareil écouteur-isolateur Expired FR494654A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR494654T

Publications (1)

Publication Number Publication Date
FR494654A true FR494654A (fr) 1919-09-16

Family

ID=8904728

Family Applications (1)

Application Number Title Priority Date Filing Date
FR494654A Expired FR494654A (fr) 1917-04-20 Appareil écouteur-isolateur

Country Status (2)

Country Link
FR (1) FR494654A (fr)
GB (1) GB131381A (fr)

Also Published As

Publication number Publication date
GB131381A (fr)

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