CA157401A - Telephone exchange system - Google Patents

Telephone exchange system

Info

Publication number
CA157401A
CA157401A CA000157401A CA157401DA CA157401A CA 157401 A CA157401 A CA 157401A CA 000157401 A CA000157401 A CA 000157401A CA 157401D A CA157401D A CA 157401DA CA 157401 A CA157401 A CA 157401A
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
CA000157401A
Other languages
French (fr)
Inventor
Milo Gifford Kellogg
Alfred Hartwell Dyson
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.)
Kellogg Switchboard and Supply Co
Original Assignee
Kellogg Switchboard and Supply Co
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 Kellogg Switchboard and Supply Co filed Critical Kellogg Switchboard and Supply Co
Application granted granted Critical
Publication of CA157401A publication Critical patent/CA157401A/en
Expired legal-status Critical Current

Links

CA000157401A 1906-04-09 1906-04-09 Telephone exchange system Expired CA157401A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA157401T 1906-04-09

Publications (1)

Publication Number Publication Date
CA157401A true CA157401A (en) 1914-08-18

Family

ID=45277107

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000157401A Expired CA157401A (en) 1906-04-09 1906-04-09 Telephone exchange system

Country Status (1)

Country Link
CA (1) CA157401A (en)

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