http://www.teknuw.com/garage-door-opener-installation-manual/stanley/https://www.manualslib.com/products/Stanley-U-Install-3760134.htmlIf you can identify the model number, it may be possible to locate a manual from 1997 using the internet with http://www.google.com
According to one of the web sites above, "Stanley stopped making garage door openers and gate operators in 1997. Spare parts can be difficult to find however original and compatible remote controls are still widely available, most of the remote controls used by Stanley were manufactured by the Linear corporation.
Stanley made garage door openers for other companies and many parts are interchangeable some of the brands they manufactured for are Vemco, U-Install, Quiet Glide, Light Maker, Home Innovative, Whistler, Popular Mechanics, and Secure Code."
https://www.justanswer.com/home-improvement/7enbn-stanley-garage-door-opener-model-440-51-garage-two.html
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