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.
What is 'Obsolete Inventory'. Obsolete inventory is a term that refers to inventory that is at the end of its product life cycle and has not seen any sales or usage for a set period of time usually determined by the industry. This type of inventory has to be written down and can cause large losses for a company.