COMMERCIAL PHYSICAL AND BIOLOGICAL RESEARCH (SIC 8731)

Establishments primarily engaged in physical and biological
research and development on a contract or fee basis. 
Noncommercial research establishments (funded by endowments,
grants, or contributions) are classified in Industry 8733. 
Separate establishments of aircraft, guided missile, or
spacecraft manufacturers primarily engaged in research and
development on these products are classified in Manufacturing,
Major Group 37.