FIELD: TV equipment. SUBSTANCE: telescopic pneumatic-hydraulic mast has mobile and immobile cylindrical sections. Flexible rolling inflated shells are placed in circular clearances between sections. Inner surfaces of cylindrical sections are made smooth. Outer surface of mobile sections is wavy-shaped. Length of wavy line of contour of cross-section of mobile section is equal to length of circumference of inner surface of section matched with it. EFFECT: facilitated manufacture. 2 dwg
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