spacing of droppers

spacing of droppers: Железнодорожный термин: расстояние между струнками (при цепной подвеске контактного провода)

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Agricultural fencing — In agriculture, fences are used to keep animals in or out of an area. They can be made from a wide variety of materials, depending on terrain, location and animals to be confined. Most agricultural fencing averages about 1.5 metres (about 4 feet) … Wikipedia
TGV track construction — LGV construction is the process by which the land on which TGV trains are to run is prepared for their use, involving carving the trackbed and laying the track. It is similar to the building of standard railway lines, but there are differences.… … Wikipedia

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