CA403113A - Telephone and telegraph exchange system - Google Patents

Telephone and telegraph exchange system

Info

Publication number
CA403113A
CA403113A CA403113A CA403113DA CA403113A CA 403113 A CA403113 A CA 403113A CA 403113 A CA403113 A CA 403113A CA 403113D A CA403113D A CA 403113DA CA 403113 A CA403113 A CA 403113A
Authority
CA
Canada
Prior art keywords
telephone
exchange system
telegraph exchange
telegraph
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
CA403113A
Other languages
French (fr)
Inventor
John Singer Fred
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 CA403113A publication Critical patent/CA403113A/en
Expired legal-status Critical Current

Links

CA403113A Telephone and telegraph exchange system Expired CA403113A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA403113T

Publications (1)

Publication Number Publication Date
CA403113A true CA403113A (en) 1942-02-24

Family

ID=35413560

Family Applications (1)

Application Number Title Priority Date Filing Date
CA403113A Expired CA403113A (en) Telephone and telegraph exchange system

Country Status (1)

Country Link
CA (1) CA403113A (en)

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