The methods are particularly applicable in woodworking equipment such as power saws to distinguish contact between a person...http://www.google.co.uk/patents/US8087438?utm_source=gb-gplus-sharePatent US8087438 - Detection systems for power equipmentAdvanced Patent SearchPublication numberUS8087438 B2Publication typeGrantApplication numberUS 12/799,915Publication date3 Jan 2012Filing date3 May 2010