| 摘要 |
A football helmet is provided with a releasable face mask which is attached to the helmet by hook-and-pile fastening means. Abutment means prevent relative movement of the face mask in response to a force which impinges on the mask in a direction toward the wearer's face, but permit the mask to break away from the helmet in response to excessive forces in other directions, as when the mask is pulled forward or twisted sideways.
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