the invention consists of a shell structure comprising at least one printed laminar semiguscio (1) with cap (2) with a hole (3) designed to be traversed by a soul carrier or mast (4)on which the semigusci are intended to be positioned on top of one another to enable the composite structure results in a strong resemblance to an ear of corn.and in the system of assembly of shells on the shaft (4) in a position off and their inflections to be driven each in position almost along with the previous one in the stessa line.
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