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Japanese construction company Komatsu is getting ready to fill the country' shortage of workers with a fleet of drones. The world's second-largest producer of construction equipment is leading a new push to ship out more dornes and driverless bulldozers. The company said it will use drones from San Francisco start-up Skycatch, Inc. to perform much of the early foundation work on consutruction sites and its own unmanned bulldozers and excavators to dig holes and move earth. Komatsu hopes to expand its current fleet of 350 unmanned vehicles to 1,500 in a year or two, according to company president, Tetsuji Ohashi.