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| 3313 | Instruments for industrial process control, manufacturing | |
| 3312 | Instruments for measuring electrical quantities, manufacturing | |
| 3312 | Instruments, aeronautical, manufacturing | |
| 3312 | Instruments, electric (i.e., for testing electrical characteristics), manufacturing | |
| 3312 | Instruments, laboratory analysis type, manufacturing | |
| 3699 | Instruments, lettering, artists', manufacturing | |
| 5150 | Instruments, measuring electricity, wholesale | |
| 3311 | Instruments, microsurgical (except electromedical), manufacturing | |
| 3692 | Instruments, musical, manufacturing | |
| 5139 | Instruments, musical, wholesale | |
| 5150 | Instruments, professional, wholesale | |
| 4530 | Insulated foundation systems, installing | |
| 2811 | Insulated windows, hermetically sealed, metal frame, manufacturing | |
| 5150 | Insulated wire and cable, annunciator, building and power, wholesale | |
| 3130 | Insulated wire and cable, made from purchased wire | |
| 3130 | Insulated wire and cable, made in aluminum wire drawing plants | |
| 3130 | Insulated wire and cable, made in copper wire drawing plants | |
| 3130 | Insulated wire and cable, nonferrous, manufacturing | |
| 2610 | Insulating batts, fills or blankets, fibreglass, manufacturing | |
| 2109 | Insulating batts, fills or blankets, made from purchased paper | |
| 2692 | Insulating firebrick and shapes, clay, manufacturing | |
| 2610 | Insulating glass, sealed units, made from purchased glass | |
| 2610 | Insulating glass, sealed units, made in glass making plant | |
| 2029 | Insulating materials, cork, manufacturing | |
| 2429 | Insulating oils, manufacturing | |
| 3130 | Insulating purchased copper wire and cable | |
| 4530 | Insulating ship pipes and boilers | |
| 2520 | Insulation and cushioning, foam plastics (except polystyrene), manufacturing | |
| 2520 | Insulation and cushioning, polystrene foam, manufacturing | |
| 2021 | Insulation board, cellular fibre or hard pressed wood, manufacturing | |
| 4530 | Insulation installation, buildings, contractors | |
| 5234 | Insulation material, building, retail | |
| 5143 | Insulation materials, wholesale | |
| 4530 | Insulation of pipes and boilers, contractors | |
| 4530 | Insulation work contractors | |
| 2699 | Insulation, mineral wool, manufacturing | |
| 4530 | Insulation, vapor barriers | |
| 3190 | Insulators, bakelite, manufacturing | |
| 3190 | Insulators, electrical (except glass and ceramic), manufacturing | |
| 2691 | Insulators, electrical porcelain, manufacturing | |
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