Kelleg - Latest News 2026-07-22T22:16:33+00:00 urn:uuid:0b7b356d-98ab-c366-0274-df40578f92e5 Reaming theory and effect of self-drilling hollow anchor bolt used as soil nail urn:uuid:228e12ca-45ab-d14d-bf58-9d3841851392 2021-02-20T03:39:17+00:00