WARNING DEVICE FOR USE WITH SEATBELTS
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WHEN A SEATBELT ON A ROAD VEHICLE IS FASTENED, THE ENDS OF TWO OPTICAL CABLES ASSOCIATED WITH THE TWO PARTS OF THE SEATBELT ARE ALIGNED, AND LIGHT PASSES THROUGH ONE OF THE CABLES INTO THE OTHER CABLE AND THENCE TO A WARNING DEVICE TO INDICATE THAT THE BELT IS PROPERLY FASTENED.
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