CA464880A - Signalling system - Google Patents

Signalling system

Info

Publication number
CA464880A
CA464880A CA464880A CA464880DA CA464880A CA 464880 A CA464880 A CA 464880A CA 464880 A CA464880 A CA 464880A CA 464880D A CA464880D A CA 464880DA CA 464880 A CA464880 A CA 464880A
Authority
CA
Canada
Prior art keywords
signalling system
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
CA464880A
Other languages
French (fr)
Inventor
Dallas William
Starker Kelsey Ernest
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
Western Electric Co Inc
Publication date
Application granted granted Critical
Publication of CA464880A publication Critical patent/CA464880A/en
Expired legal-status Critical Current

Links

CA464880A Signalling system Expired CA464880A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA464880T

Publications (1)

Publication Number Publication Date
CA464880A true CA464880A (en) 1950-05-02

Family

ID=35594613

Family Applications (1)

Application Number Title Priority Date Filing Date
CA464880A Expired CA464880A (en) Signalling system

Country Status (1)

Country Link
CA (1) CA464880A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2858505A (en) * 1953-09-18 1958-10-28 Sun Oil Co Apparatus for the detection of foreign bodies
US3546580A (en) * 1967-06-06 1970-12-08 North American Rockwell Magnetic field variometer using a low noise amplifier and a coil-core arrangement of minimum weight and maximum sensitivity
US3754223A (en) * 1970-01-21 1973-08-21 Yeda Res & Dev Intruder detection system
USRE29019E (en) * 1969-01-22 1976-10-26 Yeda Research & Development Co. Ltd. Intruder detection system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2858505A (en) * 1953-09-18 1958-10-28 Sun Oil Co Apparatus for the detection of foreign bodies
US3546580A (en) * 1967-06-06 1970-12-08 North American Rockwell Magnetic field variometer using a low noise amplifier and a coil-core arrangement of minimum weight and maximum sensitivity
USRE29019E (en) * 1969-01-22 1976-10-26 Yeda Research & Development Co. Ltd. Intruder detection system
US3754223A (en) * 1970-01-21 1973-08-21 Yeda Res & Dev Intruder detection system

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