CA221515A - Telephone exchange system - Google Patents

Telephone exchange system

Info

Publication number
CA221515A
CA221515A CA221515A CA221515DA CA221515A CA 221515 A CA221515 A CA 221515A CA 221515 A CA221515 A CA 221515A CA 221515D A CA221515D A CA 221515DA CA 221515 A CA221515 A CA 221515A
Authority
CA
Canada
Prior art keywords
exchange system
telephone exchange
telephone
exchange
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
CA221515A
Other languages
French (fr)
Inventor
H. Clark Edgar
E. Lundell Alben
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.)
INTERNATIONAL WESTERN ELECTRIC Co
Original Assignee
INTERNATIONAL WESTERN ELECTRIC Co
Publication date
Application granted granted Critical
Publication of CA221515A publication Critical patent/CA221515A/en
Expired legal-status Critical Current

Links

CA221515A Telephone exchange system Expired CA221515A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA221515T

Publications (1)

Publication Number Publication Date
CA221515A true CA221515A (en) 1922-07-25

Family

ID=35117117

Family Applications (1)

Application Number Title Priority Date Filing Date
CA221515A Expired CA221515A (en) Telephone exchange system

Country Status (1)

Country Link
CA (1) CA221515A (en)

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