Ferrous metal screws manufactured under the trademark of Aviaservice LLC: certificate No. 725278: OST 1 31542-80, OST 1 3143-80, OST 1 31544-80, OST 1 31551-80, OST 1 31552-80, OST 1 31553-80, OST 1 31564-80, OST 1 31565-80
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