| 摘要 |
agriculture and construction industry. SUBSTANCE: air vent has two parts pivotally connected so as to be folded one with respect to the other. One edge of pivotally connected parts is coupled with constructional member of accommodation carcass, for instance with greenhouse ridge or chute, and opposite edge is mounted in guide for progressive movement along carcass. Opening mechanism acts upon pivot hinge which connects two parts of air vent. EFFECT: increased strength of air vent and improved ventilation. 2 cl, 15 dwg
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