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As shown in Figure 1, sealing devices come in two types: contact and non-contact.
Oil seals are among the major contact type sealing devices.
 

A spark plug ignition coil plays a crucial role in the functioning of an internal combustion engine. It is responsible for generating the high voltage needed to create a spark within the combustion chamber, igniting the air-fuel mixture and initiating the power stroke. Without a properly functioning ignition coil, the engine would not be able to start or run efficiently.