The lexicon of the top500 ( The Encyclopedia for Classification Codes ) explains the codes and definitions in the world of economical classifications.
CPC Code 61 Wholesale trade services
The CPC Code 61 is described as
Wholesale trade services
It belongs to the code group
CPC Code 6 Distributive trade services; lodging; food and beverage serving services; transport services; and utilities distribution services
To this Code "61" belongs the sub codes
CPC Code 611: Wholesale trade services, except on a fee or contract basis
CPC Code 612: Wholesale trade services on a fee or contract basis