CA612820A - Intruder alarm system - Google Patents

Intruder alarm system

Info

Publication number
CA612820A
CA612820A CA612820A CA612820DA CA612820A CA 612820 A CA612820 A CA 612820A CA 612820 A CA612820 A CA 612820A CA 612820D A CA612820D A CA 612820DA CA 612820 A CA612820 A CA 612820A
Authority
CA
Canada
Prior art keywords
alarm system
intruder alarm
intruder
alarm
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
CA612820A
Inventor
M. Gibson Frederick
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.)
American District Telegraph Co
Original Assignee
American District Telegraph Co
Publication date
Application granted granted Critical
Publication of CA612820A publication Critical patent/CA612820A/en
Expired legal-status Critical Current

Links

CA612820A Intruder alarm system Expired CA612820A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA612820T

Publications (1)

Publication Number Publication Date
CA612820A true CA612820A (en) 1961-01-17

Family

ID=35855140

Family Applications (1)

Application Number Title Priority Date Filing Date
CA612820A Expired CA612820A (en) Intruder alarm system

Country Status (1)

Country Link
CA (1) CA612820A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3056470A (en) * 1959-04-09 1962-10-02 Schweiz Wagons Aufzuegefab Control system for elevators
US3075617A (en) * 1960-04-04 1963-01-29 Schweiz Wagons Aufzuegefab Safety means for the door of an elevator
US3531792A (en) * 1966-12-06 1970-09-29 Samuel M Bagno Alarm system using saturable contacts

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3056470A (en) * 1959-04-09 1962-10-02 Schweiz Wagons Aufzuegefab Control system for elevators
US3075617A (en) * 1960-04-04 1963-01-29 Schweiz Wagons Aufzuegefab Safety means for the door of an elevator
US3531792A (en) * 1966-12-06 1970-09-29 Samuel M Bagno Alarm system using saturable contacts

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