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опора контактной сети stresses
gen.	catenary mast (kopeika)
construct.	railway overhead support
electr.eng.	contact line support
railw.	catenary support; contact-line mast; contact-line support; contact-line supporting structure; contact-system mast; railroad pole
tech.	trolley pole; contact system mast
опоры контактной сети
railw.	overhead structures

опора контактной сети: 17 phrases in 4 subjects

Makarov	11
Military	1
Rail transport	2
Technology	3