Ear plugs for swimmers; gas alarms; fire alarms; dustproof mask performance measuring devices, namely, measuring devices for evaluating sealing effect of the mask, which is evaluated by air-leakage between a mask and a wearer's face; electronic apparatus for monitoring, analyzing and recording the performance of dustproof masks; electric protective industrial respirators for filtering air; electric dust masks incorporating electric fans with blowers; powered air purifying protective industria...

PROTECTIVE SHEATHS FOR DENTAL TOOLS