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There are many ways to properly use a Personal Flotation Device. To use a Personal Flotation Device just pull the cord.
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Personal Flotation Device
Personal flotation devices (life preservers) are required to be worn by children under the age of eight years.
it will not turn an unconcussions person up
Exposure to the elements seems the most common reason I've found in my research of what causes personal flotation devices to wear out.
They will generally not turn an unconscious person face-up.
Personal Flotation Device
lifejacket
3,200 hunters
fishing
Children must wear personal flotation devices at age 12 and younger.