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.
When the perpetual inventory system is used, there is a continuous or perpetual record of inventory recorded in the inventory account. When a company purchases product, it is immediately recorded as inventory. When the products are sold, the inventory balance is immediately reduced (credited) and recorded in cost of goods sold.