| 46122 | Reactors, current-limiting | |
| 46122 | Reactors, electric | |
| 42310 | Reactors, fast breeder | |
| 42310 | Reactors, gas-cooled | |
| 42310 | Reactors, isotope-producing | |
| 42310 | Reactors, nuclear | |
| 42310 | Reactors, nuclear, critical | |
| 42310 | Reactors, nuclear, electrical energy-producing | |
| 42310 | Reactors, nuclear, heterogeneous | |
| 42310 | Reactors, nuclear, homogeneous | |
| 87110 | Reactors, nuclear, maintenance and repair of boilers for | |
| 42310 | Reactors, nuclear, materials-testing | |
| 42310 | Reactors, nuclear, molten-salt | |
| 42310 | Reactors, nuclear, organic moderator-type | |
| 42310 | Reactors, nuclear, pressurized-water | |
| 42310 | Reactors, nuclear, sodium-graphite | |
| 42310 | Reactors, nuclear, subcritical | |
| 42310 | Reactors, propulsion, nuclear | |
| 42310 | Reactors, research, nuclear | |
| 42310 | Reactors, thermal, nuclear | |
| 47160 | Read only memories (ROMs) | |
| 73124 | Readers, magnetic, rental or leasing of, without operator | |
| 48330 | Readers, microfiche, whether or not capable of producing copies | |
| 48330 | Readers, microfilm, whether or not capable of producing copies | |
| 48330 | Readers, microform, whether or not capable of producing copies | |
| 73124 | Readers, optical, rental or leasing of, without operator | |
| 29290 | Reading covers, of leather, for books | |
| 85999 | Reading of electric meters | |
| 85999 | Reading of gas meters | |
| 85999 | Reading of water meters | |
| 91210 | Reading rooms located abroad, operation of | |
| 88329 | Ready for use carbon paper manufacturing services | |
| 88329 | Ready to use self-copy paper manufacturing services | |
| 88213 | Ready-made textile articles, printing of | |
| 88536 | Ready-mix and dry-mix concrete and mortars manufacturing services | |
| 35270 | Reagents for the determination of HLA properties (HLA antigens) | |
| 35270 | Reagents, blood-grouping | |
| 35440 | Reagents, diagnostic, composite, inorganic or organic, not to be administered to the patient (excl. microbial reagents and blood-grouping reagents) | |
| 35270 | Reagents, diagnostic, microbial or non-microbial, designed to be administered to the patient | |
| 35270 | Reagents, diagnostic, microbial, not designed to be administered to the patient | |