CA422194A - Telephone calling device - Google Patents

Telephone calling device

Info

Publication number
CA422194A
CA422194A CA422194A CA422194DA CA422194A CA 422194 A CA422194 A CA 422194A CA 422194 A CA422194 A CA 422194A CA 422194D A CA422194D A CA 422194DA CA 422194 A CA422194 A CA 422194A
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
CA422194A
Other languages
French (fr)
Inventor
Frederick Obergfell Herbert
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.)
Automatic Electric Laboratories Inc
Associated Telephone and Telegraph Co
Original Assignee
Automatic Electric Laboratories Inc
Associated Telephone and Telegraph Co
Publication date
Application granted granted Critical
Publication of CA422194A publication Critical patent/CA422194A/en
Expired legal-status Critical Current

Links

CA422194A Telephone calling device Expired CA422194A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA422194T

Publications (1)

Publication Number Publication Date
CA422194A true CA422194A (en) 1944-08-22

Family

ID=35533183

Family Applications (1)

Application Number Title Priority Date Filing Date
CA422194A Expired CA422194A (en) Telephone calling device

Country Status (1)

Country Link
CA (1) CA422194A (en)

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