| 摘要 |
The face mask, comprising a screen (12) inside a surround (2) e.g. of a plastic material with two side pieces (5, 6) connecting it to a head strap (14), has the head strap connected to the surround by a supple cord (23, 24) of a synthetic material on each side. The cords are attached to the surround at two points (16, 17; 18, 19) spaced 30 - 40 mm apart along the side pieces, and each one passes round a curved slider (36) attached to the ends of the head strap.
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