Occupant weight detecting device

Occupied room indicator

Ocean safe

Off-center cap-level magnetic float sewer alarm

Office communication system

Oil condition detecting apparatus

Oil consumption counter

Oil deterioration detector method and apparatus

Oil leak detector

Oil leakage detection apparatus

Oil leakage detector

Oil tank sight glass monitor

Oil tank sight glass monitor

Omidirectional and directional antenna assembly

Omnidirectional acceleration alarm and switch therefor

Omnidirectional and directional antenna assembly

Omnidirectional deactivator for magnetic labels or tags of EAS s

Omnidirectional move-stop sensor

Omnidirectional passive electrical marker for underground use

On board hot bearing detector system with fault detection