KHUFU might have saved a LIFETIME KING KHUFU had only slave-power with which to build the greatest of the pyramids. With engine-power, he might have saved a lifetime and the lives of 300,000 slaves. Today, mightier and much more useful structures spring from dream to drawing board to reality in relatively short spans of time. Modern construction equip-ment powered by internal-combustion engines makes this possible. For today, the machine is the slave of man. Great dams, soaring bridges, towering buildings and broad highways are ours without backbreaking toil and wasted flesh and blood.