FR423980A - Transmetteurs téléphoniques - Google Patents

Transmetteurs téléphoniques

Info

Publication number
FR423980A
FR423980A FR423980A FR423980DA FR423980A FR 423980 A FR423980 A FR 423980A FR 423980 A FR423980 A FR 423980A FR 423980D A FR423980D A FR 423980DA FR 423980 A FR423980 A FR 423980A
Authority
FR
France
Prior art keywords
telephone transmitters
transmitters
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
FR423980A
Other languages
English (en)
Inventor
Karl Oskar Leon
Charles Claude Lewis
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
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR423980A publication Critical patent/FR423980A/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)
  • Telephone Set Structure (AREA)
FR423980A 1909-11-18 1910-11-14 Transmetteurs téléphoniques Expired FR423980A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB190926779T 1909-11-18

Publications (1)

Publication Number Publication Date
FR423980A true FR423980A (fr) 1911-05-02

Family

ID=32446571

Family Applications (1)

Application Number Title Priority Date Filing Date
FR423980A Expired FR423980A (fr) 1909-11-18 1910-11-14 Transmetteurs téléphoniques

Country Status (2)

Country Link
FR (1) FR423980A (fr)
GB (1) GB190926779A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798122A (en) * 1953-10-02 1957-07-02 Ungarsohn Harry Voice reporting apparatus and the like
CN104184859A (zh) * 2014-09-05 2014-12-03 苏州思莱特电子科技有限公司 一种手机周向消音装置

Also Published As

Publication number Publication date
GB190926779A (en) 1910-08-18

Similar Documents

Publication Publication Date Title
FR423980A (fr) Transmetteurs téléphoniques
FR405608A (fr) Transmetteurs téléphoniques
FR416171A (fr) Microphone
CH48526A (de) Mikrotelephon
FR410752A (fr) Numéroteur
FI3799A (fi) Sätt att tillverka eldfaststen
FR400082A (fr) Transmetteur téléphonique secret
DK11725C (da) Højttalende Telefonapparat.
FR401158A (fr) Figures stéréodiaphanes
CH48867A (de) Zifferblatt
CH46724A (fr) Cadran
FI3678A (fi) Borrmaskinsbord
FI3706A (fi) Hällspis
FI3759A (fi) Barkningsmaskin
FI3743A (fi) Kolsyremaskin
FI3737A (fi) Svinho
FI3734A (fi) Flasktillslutningsanordning
FI3722A (fi) Vägnings- och mätningsapparat
FI3712A (fi) Elektrisk masugn
FI3704A (fi) Spjäll-ventil
FI3702A (fi) Halksyddare
FI3669A (fi) Fyrtakts-förbrännings- eller explosionsmotor
FI3660A (fi) Timmersax
FI3655A (fi) Additionsmaskin
FI3652A (fi) Säckhållare