This invention relates to a method of manufacturing seat back frame, wherein a pair of side back frame portions are first provided. Also provided is a first upper back frame portion having an upper surface defining a first profile is provided, and a second upper back frame portion having an upper surface...http://www.google.com.au/patents/US7866689?utm_source=gb-gplus-sharePatent US7866689 - Vehicle seat frame structure and method of manufacturing same
