Includes
Electronic Countermeasures, Electronic Counter-Countermeasures, Electronic Support Measures, and Quick Reaction Capability Equipment and components specially designed therefor which are not classifiable elsewhere in the FSC structure. Excluded from this class are nonelectronic items which are properly classified in more specific classes in accordance with the FSC structure and indexes.

Notes
This class includes, and is restricted to, passive and active electronic equipment, systems, and subsystems designed to prevent or reduce an enemy's effective use of radiated electromagnetic energy or designed to insure our own effective use of radiated electromagnetic energy.

Possible NAICS Codes
334511 – Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
334290 – Other Communications Equipment Manufacturing
334220 – Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing
334412 – Bare Printed Circuit Board Manufacturing
334419 – Other Electronic Component Manufacturing
334111 – Electronic Computer Manufacturing
334515 – Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals
333998 – All Other Miscellaneous General Purpose Machinery Manufacturing
423690 – Other Electronic Parts and Equipment Merchant Wholesalers