FR518414A - écouteur téléphonique - Google Patents

écouteur téléphonique

Info

Publication number
FR518414A
FR518414A FR518414A FR518414DA FR518414A FR 518414 A FR518414 A FR 518414A FR 518414 A FR518414 A FR 518414A FR 518414D A FR518414D A FR 518414DA FR 518414 A FR518414 A FR 518414A
Authority
FR
France
Prior art keywords
phone earpiece
earpiece
phone
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
FR518414A
Other languages
English (en)
Inventor
Erich Hausdorf
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 FR518414A publication Critical patent/FR518414A/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)
FR518414A 1919-05-17 écouteur téléphonique Expired FR518414A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE337473T

Publications (1)

Publication Number Publication Date
FR518414A true FR518414A (fr) 1921-05-26

Family

ID=6221505

Family Applications (1)

Application Number Title Priority Date Filing Date
FR518414A Expired FR518414A (fr) 1919-05-17 écouteur téléphonique

Country Status (3)

Country Link
DE (1) DE337473C (fr)
FR (1) FR518414A (fr)
NL (1) NL5824C (fr)

Also Published As

Publication number Publication date
NL5824C (fr)
DE337473C (de) 1921-06-03

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