Screens have been developed which, in one aspect, have interconnection apparatus including male projections on one first screen end which are received in female openings on another adjacent screen end. In one aspect the female openings are defined by raised portions of a three-dimensional screen and the male projections either are formed of the other screen's end or are part of plugs inserted into raised portions of the first screen end. A shale shaker has been developed with such screens. In one aspect such a shale shaker has screens disposed in a tiered configuration, one screen in sealing contact with the next. Screen connector apparatus has also been developed for such screens.
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