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Page Last Modified: September 19, 2000
| OA | OB | OC | OD | OE | OF | OH | OI | OK | OL | OM | ON | OP | OR | OS | OT | OU | OV | OX | OY | OZ |
| Index entry | NAICS Code | U.S. NAICS Title |
|---|---|---|
| Oxalates (e.g., ammonium oxalate, ethyl oxalate, sodium oxalate) manufacturing | 325199 | All Other Basic Organic Chemical Manufacturing |
| Oxalic acid manufacturing | 325199 | All Other Basic Organic Chemical Manufacturing |
| Oxial mechanical face seals manufacturing | 339991 | Gasket, Packing, and Sealing Device Manufacturing |
| Oxygen equipment rental (i.e. home use) | 532291 | Home Health Equipment Rental |
| Oxygen manufacturing | 325120 | Industrial Gas Manufacturing |
| Oxygen tents manufacturing | 339112 | Surgical and Medical Instrument Manufacturing |
| OA | OB | OC | OD | OE | OF | OH | OI | OK | OL | OM | ON | OP | OR | OS | OT | OU | OV | OX | OY | OZ |