CA827244A - Apartment telephone-intercom and door release system - Google Patents

Apartment telephone-intercom and door release system

Info

Publication number
CA827244A
CA827244A CA827244A CA827244DA CA827244A CA 827244 A CA827244 A CA 827244A CA 827244 A CA827244 A CA 827244A CA 827244D A CA827244D A CA 827244DA CA 827244 A CA827244 A CA 827244A
Authority
CA
Canada
Prior art keywords
intercom
release system
door release
apartment
telephone
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
CA827244A
Inventor
T. Matthews John
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.)
Automatic Electric Laboratories Inc
Original Assignee
Automatic Electric Laboratories Inc
Publication date
Application granted granted Critical
Publication of CA827244A publication Critical patent/CA827244A/en
Expired legal-status Critical Current

Links

CA827244A Apartment telephone-intercom and door release system Expired CA827244A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA827244T

Publications (1)

Publication Number Publication Date
CA827244A true CA827244A (en) 1969-11-11

Family

ID=36304689

Family Applications (1)

Application Number Title Priority Date Filing Date
CA827244A Expired CA827244A (en) Apartment telephone-intercom and door release system

Country Status (1)

Country Link
CA (1) CA827244A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4937855A (en) * 1988-02-09 1990-06-26 Viscount Industries Limited Building security system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4937855A (en) * 1988-02-09 1990-06-26 Viscount Industries Limited Building security system

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