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натяжной блок stresses
automat.	tension pulley block
cables	tension pulley
forestr.	stretching pulley; tightening block
Makarov.	lightening block
mil., tech.	straining pulley
tech.	guide pulley; idler pulley; stringing block; tension block

натяжной блок: 3 phrases in 2 subjects

Construction	2
Military	1