CA497641A - Telephone systems - Google Patents

Telephone systems

Info

Publication number
CA497641A
CA497641A CA497641A CA497641DA CA497641A CA 497641 A CA497641 A CA 497641A CA 497641 A CA497641 A CA 497641A CA 497641D A CA497641D A CA 497641DA CA 497641 A CA497641 A CA 497641A
Authority
CA
Canada
Prior art keywords
telephone systems
telephone
systems
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
CA497641A
Other languages
French (fr)
Inventor
A. Stallworthy Frank
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.)
Siemens Brothers and Co Ltd
Original Assignee
Siemens Brothers and Co Ltd
Publication date
Application granted granted Critical
Publication of CA497641A publication Critical patent/CA497641A/en
Expired legal-status Critical Current

Links

CA497641A Telephone systems Expired CA497641A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA497641T

Publications (1)

Publication Number Publication Date
CA497641A true CA497641A (en) 1953-11-10

Family

ID=35643072

Family Applications (1)

Application Number Title Priority Date Filing Date
CA497641A Expired CA497641A (en) Telephone systems

Country Status (1)

Country Link
CA (1) CA497641A (en)

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