| 2007 NAICS | 2012 NAICS | 2017 NAICS | Corresponding Index Entries | |||
| 335999 | 335999 | 335999 | Amplifiers, magnetic, pulse, and maser, manufacturing | |||
| 335999 | 335999 | 335999 | Appliance cords made from purchased insulated wire | |||
| 335999 | 335999 | 335999 | Atom smashers (i.e., particle accelerators) manufacturing | |||
| 335999 | 335999 | 335999 | Battery chargers, solid-state, manufacturing | |||
| 335999 | 335999 | 335999 | Bells, electric, manufacturing | |||
| 335999 | 335999 | 335999 | Betatrons manufacturing | |||
| 335999 | 335999 | 335999 | Capacitors (except electronic), fixed and variable, manufacturing | |||
| 335999 | 335999 | 335999 | Cathodic protection equipment manufacturing | |||
| 335999 | 335999 | 335999 | Chimes, electric, manufacturing | |||
| 335999 | 335999 | 335999 | Cleaning equipment, ultrasonic (except dental, medical), manufacturing | |||
| 335999 | 335999 | 335999 | Condensers (except electronic), fixed and variable, manufacturing | |||
| 335999 | 335999 | 335999 | Cyclotrons manufacturing | |||
| 335999 | 335999 | 335999 | Door opening and closing devices, electrical, manufacturing | |||
| 335999 | 335999 | 335999 | Electric bells manufacturing | |||
| 335999 | 335999 | 335999 | Electric fence chargers manufacturing | |||
| 335999 | 335999 | 335999 | Electrochemical generators (i.e., fuel cells) manufacturing | |||
| 335999 | 335999 | 335999 | Electron linear accelerators manufacturing | |||
| 335999 | 335999 | 335999 | Electrostatic particle accelerators manufacturing | |||
| 335999 | 335999 | 335999 | Extension cords made from purchased insulated wire | |||
| 335999 | 335999 | 335999 | Fuel cells, electrochemical generators, manufacturing | |||
| 335999 | 335999 | 335999 | Garage door openers manufacturing | |||
| 335999 | 335999 | 335999 | Gongs, electric, manufacturing | |||
| 335999 | 335999 | 335999 | Inverters, solid-state, manufacturing | |||
| 335999 | 335999 | 335999 | Linear accelerators manufacturing | |||
| 335999 | 335999 | 335999 | Maser (i.e., microwave amplification by stimulated emission of radiation) amplifiers manufacturing | |||
| 335999 | 335999 | 335999 | Mercury arc rectifiers (i.e., electrical apparatus) manufacturing | |||
| 335999 | 335999 | 335999 | Particle accelerators, high-voltage, manufacturing | |||
| 335999 | 335999 | 335999 | Photovoltaic panels made from purchased cells | |||
| 335999 | 335999 | 335999 | Power converter units (i.e., AC to DC), static, manufacturing | |||
| 335999 | 335999 | 335999 | Power supplies, regulated and unregulated, manufacturing | |||
| 335999 | 335999 | 335999 | Rectifiers (except electronic component-type, semiconductor) manufacturing | |||
| 335999 | 335999 | 335999 | Semiconductor battery chargers manufacturing | |||
| 335999 | 335999 | 335999 | Semiconductor high-voltage power supplies manufacturing | |||
| 335999 | 335999 | 335999 | Series capacitors (except electronic) manufacturing | |||
| 335999 | 335999 | 335999 | Surge suppressors manufacturing | |||
| 335999 | 335999 | 335999 | Thermoelectric generators manufacturing | |||
| 335999 | 335999 | 335999 | Ultrasonic cleaning equipment (except dental, medical) manufacturing | |||
| 335999 | 335999 | 335999 | Ultrasonic generators sold separately for inclusion in tools and equipment manufacturing | |||
| 335999 | 335999 | 335999 | Uninterruptible power supplies (UPS) manufacturing | |||
| 335999 | 335999 | 335999 | UPS (uninterruptible power supplies) manufacturing |