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 (American English) or stock (British English) is the goods and materials that a business holds for the ultimate goals to have a purpose of resale (or repair). Inventory management is a discipline primarily about specifying the shape and placement of stocked goods.