Autolite copper core spark plugs use a copper-glass seal that bonds the insulator and terminal post center electrode together.
Overproduction or overstocking leads to increased inventory and money sitting idle. Inventory means any goods that are being held for any length of time, inside or outside the factory. In the Lean system, inventory is regarded as a symptom of a sick factory.
Inventory control is necessary in retail sales, wholesale sales, in manufacturing, and construction, where such materials are time critical and need to be available at the moment of request. Warehousing is a control which manages and maintains the storage area for the inventory.