The method further including attaching a diaphragm made of a metal to the sheet...http://www.google.com.au/patents/US6038961?utm_source=gb-gplus-sharePatent US6038961 - Flush mount remote sealAdvanced Patent SearchPublication numberUS6038961 APublication typeGrantApplication numberUS 09/033,374Publication date21 Mar 2000Filing date2 Mar 1998Priority date2 Mar 1998Fee statusPaidAlso published asEP0