Nodes to be recorded

Symbol

Supplier

$S^i$ -Supply

Parts

$L^i$ -Ling Bu Jian

Procedure

$P^i$ -Procedure

Workers

$W^i$ -Workers

Assembly units

$A^i$ -Assembly

Box

-Box

Group

-Group

Vehicle

-Vehicle

Consumer

-Consumer

Improved parts

-Improve

Manufacturing enterprise

-Enterprise