- Developed in the 1930s, the Standard Industrial Classification (SIC) code is a 4-digit scheme that organizes 1,004 industries. Some 400 of these are services.
- Developed in 1997, the North American Industrial Classification System (NAICS), is a six-digit scheme that organizes 1,170 industries, of which 565 are services. Many of the NAICS industries emerged over the past 20 years.
For more information, see:
- SIC Codes. Major Group 39: Miscellaneous Manufacturing Industries
Covers "establishments primarily engaged in manufacturing sporting and athletic goods, not elsewhere classified, such as fishing tackle; golf and tennis goods; baseball, football, basketball, and boxing equipment; roller skates and ice skates; gymnasium and playground equipment; billiard and pool tables; and bowling alleys and equipment."