If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email email@example.com.
Please tell us what format you need. It will help us if you say what assistive technology you use.
Patent decision: O/057/91 in the matter of an application by Soldek Systems Ltd for the restoration of Patent no 2091311 dated 21 May 1991.