FR717470A - Protection device for telephone devices - Google Patents

Protection device for telephone devices

Info

Publication number
FR717470A
FR717470A FR717470DA FR717470A FR 717470 A FR717470 A FR 717470A FR 717470D A FR717470D A FR 717470DA FR 717470 A FR717470 A FR 717470A
Authority
FR
France
Prior art keywords
protection device
telephone devices
telephone
devices
protection
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)
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.)
Societe des Telephones Ericsson SA
Original Assignee
Societe des Telephones Ericsson SA
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 Societe des Telephones Ericsson SA filed Critical Societe des Telephones Ericsson SA
Application granted granted Critical
Publication of FR717470A publication Critical patent/FR717470A/en
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
    • H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
FR717470D 1930-08-24 1931-05-21 Protection device for telephone devices Expired FR717470A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE563838T 1930-08-24

Publications (1)

Publication Number Publication Date
FR717470A true FR717470A (en) 1932-01-09

Family

ID=34559085

Family Applications (1)

Application Number Title Priority Date Filing Date
FR717470D Expired FR717470A (en) 1930-08-24 1931-05-21 Protection device for telephone devices

Country Status (2)

Country Link
DE (1) DE563838C (en)
FR (1) FR717470A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL77026C (en) * 1951-01-25

Also Published As

Publication number Publication date
DE563838C (en) 1932-11-10

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