A box joint jig, including a bottom plate; a back plate joined to the bottom plate; and an alignment member the alignment member structured to orient four boards positioned adjacent the bottom plate for a router and a method of forming a box joint, including the steps of mounting four boards in a jig;...http://www.google.es/patents/US20050056344?utm_source=gb-gplus-sharePatente US20050056344 - Jig for forming a box joint
