When 20 units is reached, the card will be turned in to the manufacturer and more units will be produced. Likewise, if an upper card is set, production will stop until the lower limit is reached. This keeps inventory costs down and management happy.

When this system was created in the 1940s, it was all done with large black or white boards and chalk or pen. Now there are these boards that are available through online sources.

retro bike jersey

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