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CA381620A - Electrical signalling apparatus - Google Patents

Electrical signalling apparatus

Info

Publication number
CA381620A
CA381620A CA381620A CA381620DA CA381620A CA 381620 A CA381620 A CA 381620A CA 381620 A CA381620 A CA 381620A CA 381620D A CA381620D A CA 381620DA CA 381620 A CA381620 A CA 381620A
Authority
CA
Canada
Prior art keywords
signalling apparatus
electrical signalling
electrical
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
CA381620A
Other languages
French (fr)
Inventor
Joseph Crane Carl
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.)
Individual
Original Assignee
Individual
Publication date
Application granted granted Critical
Publication of CA381620A publication Critical patent/CA381620A/en
Expired legal-status Critical Current

Links

CA381620A Electrical signalling apparatus Expired CA381620A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA381620T

Publications (1)

Publication Number Publication Date
CA381620A true CA381620A (en) 1939-05-30

Family

ID=35386859

Family Applications (1)

Application Number Title Priority Date Filing Date
CA381620A Expired CA381620A (en) Electrical signalling apparatus

Country Status (1)

Country Link
CA (1) CA381620A (en)

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