Life vests and life jackets are known as personal flotation devices of PFDs. They are meant to keep a person afloat in the water in case of an emergency. They are considered life-saving equipment. Their main function is to keep a person on the surface of the water in a relatively upright position in order…
https://foodforthebrainblog.wordpress.com/2015/03/24/how-personal-flotation-devices-came-about/
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