The main purpose of an assembly is to show the components assembled together which translate into the Bill Of Materials with some kind of chronological order. Accordingly to the assembly drawing, to consider a top level assembly complete, you need to have assembled all the sub-assemblies, and each sub-assembly cannot be complete without having assembled all its sub-sub-assemblies, etc… Thus, it is possible to use an assembly not only to make sure that everything is assembled following the right sequence, but to sequence anything!

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