prov:value
| - Preferably, the three bars 3, 4 and 5 are constituted by tubes made of a composite material containing fibers (glass, carbon, boron or other fibers, or a mixture thereof), covered with synthetic resin, by any known method (filament winding, superposed braidings, weaving, etc. . . . ), permitting to obtain for said tubes high values of the ratio R/E , in which R is the breaking stress and E the ela
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