| 摘要 |
It comprises a case 1 on which is positioned a glass 4; both are grooved on their inner faces in contact with a furrow 22 where the joint 2 is placed. On their outer faces they receive two parallel grooves extending over the sides 15 and 16. In these grooves are positioned four identical forks 6; the latter are equipped with protuberances 20 pierced at their centre in order to permit the passage of a rod 7 for the attachment of a bracelet 8, and these forks are fixed to the case by screws 9. <IMAGE>
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