Makers of the devices say they kill bacteria and viruses because they help to remove the wetness that germs need to survive.

VOA: special.2009.07.14

Thirty percent of the devices had high levels of Mycobacterium avium, an organism linked to lung disease.

VOA: special.2009.10.13

If he falls, he is protected by the rope connected to the devices and the belayer.

VOA: special.2009.12.09

Scientists place the devices around the lions' necks so they can follow their movements.

VOA: special.2009.05.05

Companies that produce the devices usually provide directions about using the device correctly.

VOA: special.2010.02.02

The devices are connected to a piece of equipment called a pulse generator.

VOA: special.2009.04.07

But the report says the devices should be used only when necessary.

VOA: special.2010.05.25

Worldwide,some experts,say the devices have protected up to a million people.

VOA: special.2010.02.09

Medical historians say the devices appeared late in the nineteenth century.

VOA: special.2009.08.11

The devices are designed to remove dangerous particles from the air.

VOA: special.2009.07.14

They also connect their ropes to the devices.

VOA: special.2009.12.09

His theory was that the devices and body should remain firm, allowing the strings to vibrate longer and sustain a sound.

VOA: standard.2009.08.14

The devices would have been assembled in airplane toilets and detonated by suicide bombers.

VOA: standard.2009.09.07

Hande worked with banks to secure the funding so householders could buy the devices.

VOA: standard.2009.12.18