The speaker head is inserted into the protective ear insert and into one of the wearer's ears so that the audio signal is audible to the wearer in a loud environment where exterior noise is muffled by the protective ear insert and the speaker head is shielded from contact with the wearer. The protective insert is removably and moveably secured to the frame and variably positionable in accordance with the location of the wearer's ears.

 
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> Methods and apparatus for improving the cold starting capability of a fuel cell

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