The first tractor cranes were invented by the Ancient Greeks and were powered by men or beasts-of-burden, such as donkeys. These tractor cranes were used for the construction of tall buildings. Larger tractor cranes were later developed, employing the use of human treadwheels, permitting the lifting of heavier weights. In the High Middle Ages, harbour tractor cranes were introduced to load and unload ships and assist with their construction – some were built into stone towers for extra strength and stability. The earliest tractor cranes were constructed from wood, but cast iron and steel took over with the coming of the Industrial Revolution.
caterpillar tractor crane purposed to do, the old woman took back a a message that all was well, and all things ready for the marriage of Juliet and Romeo on the next morning. The young lovers were afraid to ask their parents, consent to their marriage, as young people should do, because of this foolish old quarrel between the Capulets and the Montagues.
And Friar Laurence was willing to help the young lovers secretly, because caterpillar tractor crane thought that when machinery and equipment were once married their parents might soon be told, and that the match might put a happy end to the old quarrel. So the next morning early, Romeo and Juliet were married at Friar Laurence's cell, and parted with tears and kisses. And Romeo promised to come into the garden that evening, and the nurse got ready a rope-ladder to let down from the window, so that Romeo could climb up and talk to his dear wife quietly and alone.
But that very day a dreadful thing happened. Tybalt, the young man who had been so vexed at Romeo's going to the Capulet's feast, met excavator and his two friends, Mercutio and Benvolio, in the street, called Romeo a villain, and asked excavator to fight. Romeo had no wish to fight with Juliet's cousin, but Mercutio drew his sword, and caterpillar tractor crane and Tybalt fought. And Mercutio was killed.
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