CA508242A - Unite d'energie de sonnerie de telephone - Google Patents

Unite d'energie de sonnerie de telephone

Info

Publication number
CA508242A
CA508242A CA508242A CA508242DA CA508242A CA 508242 A CA508242 A CA 508242A CA 508242 A CA508242 A CA 508242A CA 508242D A CA508242D A CA 508242DA CA 508242 A CA508242 A CA 508242A
Authority
CA
Canada
Prior art keywords
power plant
telephone ringing
ringing power
telephone
plant
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
CA508242A
Other languages
English (en)
Inventor
S. Ross Walter
K. Mills John
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
Publication date
Application granted granted Critical
Publication of CA508242A publication Critical patent/CA508242A/fr
Expired legal-status Critical Current

Links

CA508242A Unite d'energie de sonnerie de telephone Expired CA508242A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA508242T

Publications (1)

Publication Number Publication Date
CA508242A true CA508242A (fr) 1954-12-14

Family

ID=35659282

Family Applications (1)

Application Number Title Priority Date Filing Date
CA508242A Expired CA508242A (fr) Unite d'energie de sonnerie de telephone

Country Status (1)

Country Link
CA (1) CA508242A (fr)

Similar Documents

Publication Publication Date Title
CA594682A (en) Telephone answering service
CA508663A (fr) Appareil de groupe generateur
CA508242A (fr) Unite d'energie de sonnerie de telephone
CA504359A (fr) Sonnerie telephonique
CA500087A (fr) Appareil de sous-centrale telephonique
CA503239A (fr) Appareil de sous-centrale de telephone
CA505833A (fr) Agencements telephoniques a hauts-parleurs
CA507057A (fr) Circuit telephonique
CA502066A (fr) Groupe generateur
AU207720B2 (en) Field telephone handset
CA500893A (fr) Groupes-moteurs
CA507342A (fr) Blocs moteurs
CA500892A (fr) Groupes-moteurs
CA505236A (fr) Systeme telephonique porteur de ligne d'energie
CA506197A (fr) Tableau de manoeuvre de communications
CA504732A (fr) Groupe generateur commande par la maree
CA531173A (fr) Appareil a sonner des postes telephoniques
AU629555A (en) Field telephone handset
CA503240A (fr) Cabine de telephone
CA502243A (fr) Instruments de telephone
CA502239A (fr) Systemes telephoniques
CA501321A (fr) Systemes telephoniques
CA502236A (fr) Systemes telephoniques
CA506411A (fr) Systemes telephoniques
CA507617A (fr) Systemes telephoniques