... various conditions 3.energy saving technology 4.long service time 4-section R-shaped boom with compact ... for small directional control impact and high reliability;Automatic retraction of concrete piston makes it easier to ... 37M Truck-mounted Concrete Pump class includes SY5253THB 37M, SY5255THB 37, SY5260THB 37B, SY5261THB 37V, SY5271THB 37(JZ), SY5293THB 37(JZ), SY5295THB 37(JZ), SY5296THB 37(JZ ...