CA424750A - Telephone calling device - Google Patents

Telephone calling device

Info

Publication number
CA424750A
CA424750A CA424750A CA424750DA CA424750A CA 424750 A CA424750 A CA 424750A CA 424750 A CA424750 A CA 424750A CA 424750D A CA424750D A CA 424750DA CA 424750 A CA424750 A CA 424750A
Authority
CA
Canada
Prior art keywords
calling device
telephone calling
telephone
calling
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
CA424750A
Other languages
French (fr)
Inventor
A. Cosgrove 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.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
Western Electric Co Inc
Publication date
Application granted granted Critical
Publication of CA424750A publication Critical patent/CA424750A/en
Expired legal-status Critical Current

Links

CA424750A Telephone calling device Expired CA424750A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA424750T

Publications (1)

Publication Number Publication Date
CA424750A true CA424750A (en) 1944-12-26

Family

ID=35535765

Family Applications (1)

Application Number Title Priority Date Filing Date
CA424750A Expired CA424750A (en) Telephone calling device

Country Status (1)

Country Link
CA (1) CA424750A (en)

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