Tapered shutters used for pre-cast reinforced mortar rings Kay Davey Rod Shaw Ken Chatterton 10.17028/rd.lboro.8059235.v1 https://repository.lboro.ac.uk/articles/figure/Tapered_shutters_used_for_pre-cast_reinforced_mortar_rings/8059235 Tapered shutters used for pre-cast reinforced mortar rings 2019-05-02 11:32:59 WEDC Technical Wells International and Development Communication