| 摘要 |
<p>A helmet comprises a headshell, visor and a harness within which the head of the user is en- gagable. An auxiliary electrically operated service is provided such as a lamp or air supply operated by switch means which are actuated as the helmet is engaged on or disengaged from the head of the user. Where the service is an air supply, the switch operates a fan motor which draws air into the helmet through a filter.</p> |
