In a system for coding a pallet on which a plurality of parts are assembled to form a workpiece in an assembly line, a drive for moving the pallet in a conveying path along the assembly line to successive work stations where the parts are processed or assembled, a plurality of signal carriers on the...http://www.google.com/patents/US4591991?utm_source=gb-gplus-sharePatent US4591991 - Coding method and system for assembly line pallets
