Kit for retrofitting manually operated electric garage door to o

Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel

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Details

318266, 318469, 49 26, 49 30, E05F 1516

Patent

active

060753331

ABSTRACT:
A method and apparatus for retrofitting a manually operated commercial garage door opener to function automatically.

REFERENCES:
patent: 3783556 (1974-01-01), Cook
patent: 4843639 (1989-06-01), Beals
patent: 5285136 (1994-02-01), Duhame

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