A screw-less fixing structure is provided for users to mount the add-on card onto a PC. The screw-less fixing structure comprises a support plate, a rotational pressing plate, a positioning device, and a spring wire. When a user attempts to replace an old add-on card with a new one, he needs only to...http://www.google.com/patents/US6515867?utm_source=gb-gplus-sharePatent US6515867 - Screw-less fixing structure
