@Override
public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
TileEntity tile_entity = world.getBlockTileEntity(x, y, z);
if(tile_entity instanceof TileEntityIronFurnace){
return new GuiIronFurnace(player.inventory, (TileEntityIronFurnace) tile_entity);
}
if(tile_entity instanceof TileEntityOreGrinder){
return new GuiOreGrinder(player.inventory, (TileEntityOreGrinder) tile_entity);
}