Solid-state delay timed switching circuit
Sonic monitoring method and apparatus
Sound activated alarm system
Sound and light signaling system
Sound generating device for jogger
Sound responsive light device
Splitter
Sporting game time-out indicator
Sports monitoring and tracking system
Sports timing system
Sports whistle with audible and visual output signals
Spread spectrum transmission system
Spring-actuated security alarm for a door
Stage programmable light sequencer for a toy
Static charge detector having fail-safe voltage surge protection
Static magnetic field metal detector
Storage case for an orthodontic retainer and the like
Strain detection apparatus and method for radiological equipment
Strobe alarm circuit
Strobe alarm with strobe intensity selector switch