541330

Chemical Engineering Services

541330

Mechanical Engineering Services

541511

Custom Computer Programming Services

541519

Other Computer Related Services

541512

Computer Systems Design Services

541611

Admin / General Mgmt Consulting Services

541191

Online Information Services

541618

Other Management Consulting Services

541710

Chemical R&D Services, Computer H/W & S/W, Engineering R&D

541710

Guided Missile and Space Vehicle Engine and Parts R&D