| - they, in such opened position, have a radius of curvature not less than 2,5 mm (this requirement does not apply if in maximum opened position the projection is less than 5 mm, in which case the angles of the parts fa | a0c0 |
| - they, in such opened position, have a radius of curvature not less than 2,5 mm (this requirement does not apply if in maximum opened position the projection is less than 5 mm, in which case the angles of the parts fa | a0c0 |