CA219774A - Systeme de signaux par frequence a deux voies - Google Patents

Systeme de signaux par frequence a deux voies

Info

Publication number
CA219774A
CA219774A CA219774A CA219774DA CA219774A CA 219774 A CA219774 A CA 219774A CA 219774 A CA219774 A CA 219774A CA 219774D A CA219774D A CA 219774DA CA 219774 A CA219774 A CA 219774A
Authority
CA
Canada
Prior art keywords
signalling system
way frequency
frequency signalling
way
signalling
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
CA219774A
Other languages
English (en)
Inventor
W. Nichols Harold
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.)
INTERNATIONAL WESTERN ELECTRIC Co
Original Assignee
INTERNATIONAL WESTERN ELECTRIC Co
Publication date
Application granted granted Critical
Publication of CA219774A publication Critical patent/CA219774A/fr
Expired legal-status Critical Current

Links

CA219774A Systeme de signaux par frequence a deux voies Expired CA219774A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA219774T

Publications (1)

Publication Number Publication Date
CA219774A true CA219774A (fr) 1922-06-20

Family

ID=35114218

Family Applications (1)

Application Number Title Priority Date Filing Date
CA219774A Expired CA219774A (fr) Systeme de signaux par frequence a deux voies

Country Status (1)

Country Link
CA (1) CA219774A (fr)

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