| http://www.w3.org/ns/prov#value | - A modular retroactive keyboard having a plurality of keys for conveying to a user a tactile characteristic of said keys, wherein:each of said keys forming an element of an independent flat parallelepipedic module comprising a motor, a position detector and electric connection means; each module comprising means for attaching said each module to an adjacent one of said modules, the keys including m
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