Construction pros are no strangers to heavy equipment, but two new machines working on the eastern span of the $5.5-billion San Francisco-Oakland Bay Bridge make most ordinary tools look like children’s toys. Slide Show Photo: American Bridge/Fluor Enterprises Inc. Joint Venture The muscular Left Coast Lifter can now begn to erect steel on the New Bay Bridge. Related Links: Volvo's Fenix Asphalt Paver Concept Is a Vision Of Automated Processes and Sustainability General Motors Tests Diesel-Like Powerplant To Meet Future Fuel Economy, Carbon Cuts Mike Flowers, project director for American Bridge/Fluor Enterprises Inc. joint venture, says he knew very early