| http://www.w3.org/ns/prov#value | - Extending substantially centrally about the coupling in a plane substantially normal to plane 36 is a groove 38b which receives, in the embodiment of the invention now being described, an endless elastomer band, or a springparting means, 40, whose function will be explained shortly.Mouth-bow 34 has the curved and bent configuration shown clearly in FIG. 2 including rear-end attaching portions 34a
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