Screened spark plug

Screened spark plug

Sealing electrode and surge absorber using such electrodes

Secondary air guide ring for ignition plug

Self-balancing bipolar air ionizer

Self-supporting load bearing voltage grading resistors for a...

Semi-automatic spark gap setter

Series gapped metal oxide surge arrester

Shielded ignition system

Shielded spark plug for aircraft engines

Shielded spark plug for aircraft engines

Signal attenuator

Slide-spark electrode system

Solid state spark gap

Spark discharge device

Spark discharge device

Spark discharge plugs

Spark extinguishing device

Spark gap

Spark gap