Object detection

Object locator system employing variable frequency code tone gen

Obstacle detector for a vehicle

Obstruction warning system

Odograph and heading indicator therefor

Offroad vehicle inclinometer and alarm

Offshore marine seismic source tow systems and methods of formin

Offshore seismic surveying technique

Oil gauge accessory for automotive vehicles

Oil level detection circuit

Oil level detector and indicator

Omnidirectional speed cockpit display

Omnidirectional visual vehicular warning system

On-board apparatus for monitoring the condition of shock absorbe

One-way messaging receiver

Open circuit alarm

Operating condition signal light for an automotive vehicle

Operation recorder for motor vehicle safety device

Optic scattering acoustic transducer

Optical multiple output display system, particularly for automot