CA501719A - Control apparatus for telephone systems - Google Patents

Control apparatus for telephone systems

Info

Publication number
CA501719A
CA501719A CA501719A CA501719DA CA501719A CA 501719 A CA501719 A CA 501719A CA 501719 A CA501719 A CA 501719A CA 501719D A CA501719D A CA 501719DA CA 501719 A CA501719 A CA 501719A
Authority
CA
Canada
Prior art keywords
control apparatus
telephone systems
telephone
systems
control
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
CA501719A
Other languages
French (fr)
Inventor
W. Breisch Edgar
W. Mckenna George
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.)
Hitachi Rail STS USA Inc
Original Assignee
Union Switch and Signal Inc
Publication date
Application granted granted Critical
Publication of CA501719A publication Critical patent/CA501719A/en
Expired legal-status Critical Current

Links

CA501719A Control apparatus for telephone systems Expired CA501719A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA501719T

Publications (1)

Publication Number Publication Date
CA501719A true CA501719A (en) 1954-04-20

Family

ID=35647618

Family Applications (1)

Application Number Title Priority Date Filing Date
CA501719A Expired CA501719A (en) Control apparatus for telephone systems

Country Status (1)

Country Link
CA (1) CA501719A (en)

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