IndustriesSIC 3661
SIC · 1987
Telephone and Telegraph Apparatus
3661
Telephone and Telegraph Apparatus. SIC 3661 is a class in the 1987 Standard Industrial Classification, the U.S. system that groups an establishment by its main activity. Vertical files a record here when this class is the closest fit for what it makes, publishes, or practices, so the sector can be read across files.
Same records, NAICS