Back-up electrical system for lamps

Back-up lighting system

Back-up power system

Back-up system for the supply of voltage in television cable...

Backup power circuit

Backup power module for industrial control and monitoring...

Backup power system and method

Backup protection switch to prevent reverse power flow in a ups

Backup protection switch to prevent reverse power flow in a ups

Balancer executed with z-connected windings

Ballast filtering scheme for reduced harmonic distortion

Bar code reading method and apparatus for a battery tester...

Barrier movement operator battery backup and power equipment...

Battery and flashlight recharger

Battery backup for ac powered dc supply

Battery booster

Battery booster cables

Battery boosting apparatus and method

Battery charge detector and charging system including such...

Battery charge indication methods, battery charge monitoring...