Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1997-12-12
2000-06-13
Ro, Bentsu
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
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
Nissle, P.C. Tod R.
Ro Bentsu
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