| 摘要 |
"Three-conical" signal for industrial surveys stituted by a vertical transparent cylinder, inside which two conical axial cavities are excavated, unsymmetrical, opposite to each other, and painted in luminescent orange color, whose vertices are connected by a vertical cylindrical bore; said vertical cylinder is supported by a base which supports in its turn within the lower conical cavity a parabolic reflector and a lamp, and is provided atop with a conical cap axially provided with a small transparent vertical cylinder, ending with a sharp conical top, and being provided in its lower portion with a surface having the shape of a spherical cap.
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