Tender for Execution of specialized works of conservation for the equation for the public visit of the construction set of holy pigeons in accordance with the value valued memory, the technical procedure is restricted to the use of a work that requires a particularly qualified one. The application of the restricted procedure will be developed in two different stages: phase 1: reception and selection of participation requests or candidates in attention to their own single language: phase: selection of propositions presented by the expected companies to do so