Arrangement for marking an assembly of at least two parts

摘要

The first component (1) has profiled portions into which the second component can fit. There is a window or display area (2) which may be marked with a serial number. A similar area on the second component carries the serial number for the second component. The second serial number may cover the first when the two components are assembled together correctly. There is a hole adjacent to the second serial number which allows the first number to be seen.