Помогите с терминами- интрукция

[karifa]

не могу найти переводов следующих слов
multi-level slits
rib recess
и как в этой инструкции переводится глагол provided

вот сам текст

PROBLEM TO BE SOLVED: To provide a bracket, which has to be prevented from being shaked laterally,; SOLUTION: A bracket for display shelf comprises locking hooks 10 provided at the rear end of a bracket 1 inserted into vertical multi-level slits 107 provided in a support member 102, a rib recess 12 provided in front of the locking hook 10, and a flat shaking-preventing member 2 provided with a rib 22 engaging to the rib recess 12 and slidably mounted on the bracket 1. The shaking-preventing member 2 is formed with a projection rib 21 fitted into a gap between the slit 107 and the locking hook 10.

[delta]

locking hooks 10 provided at the rear end – предусмотренные, установленные, прикрепленные
member 2 provided with a rib – с, снабженный(ая), содержащий, имеющий