Description: a unique number assigned to a particular unit of some product to identify it; Name: Producer serial number
Description: Unique combination of numbers and letters used to identify the device once it has been manufactured; Name: Serial number
Description: a specific design within the context of a type, which is generally characterized by its dimensions. A construction can comprise several design (variants), which generally vary in terms of mechanical details; Name: Construction form of the seal surface, connection, muff A1