sentences:  In 1969 Dooley designed the first fully integrated D/A converter (DAC), the 6-bit DAC01, using diffused resistors.He recruited his thin film technician with precision resistor fabrication skills that were essential for improving the accuracy of DACs, which became the biggest-selling type of product that helped launch the company.Semiconductor and materials engineer Wadie Khadder was hired with founder stock from Fairchild to support Bresee in both semiconductor process engineering and also the critical precision thin film technology initially needed for producing high accuracy 2-chip D/A converters.