... porous bricks, standard bricks, and hollow bricks.2, Double material-feeding system: can produce all kinds of colored road bricks, ... porous bricks, standard bricks, and hollow bricks. 2, Double material-feeding system: can produce all kinds of colored road bricks, ... bricks, and slope protection bricks etc. 3, PLC operating system: guarantees the machine safely and reliably in the operation procedure ...