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Grille spiral bevel gear 2 stage tire building machine lifesaving equipment pressure vessels steel gratings CNC cutting machine/cutter marine outfitting complete equipment weldment machine processing forging parts casting parts               trench grate 3 This trench grate can be used as the grates on the water supply and sewerage borehole or gas hole,manhole,and so on.Usually,it is designed as rotating style,and rotating angle is 110°.The trench grate with pin,anti-theft and work easily. Up product：serrated steel grating          Next Product：trench grates 2

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