| 摘要 |
Attachment (10) has vertical (34) and horizontal (36) sections, slightly parallel to vertical (22) and horizontal (24) secti of sheet steel (12), and attached to each other with longitudinal hinge (38). Inner faces (35, 37) of each sides (34, 36) has assembling groove (42, 44). Each clip (50) is double clip, i.e. it comprises first elastic clamp (66) securing groove (42), and second elastic clamp (6 securing groove (44).
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