|
| 8512 | Radiologists' offices | |
| 5233 | Radios (including C.B. or GRS), motor vehicle, retail | |
| 5139 | Radios and tape decks, motor vehicle, new, wholesale | |
| 5139 | Radios, household-type, wholesale | |
| 0112 | Radish farming | |
| 1200 | Radium bearing ore milling | |
| 2330 | Radium chloride, manufacturing | |
| 3311 | Radium equipment, manufacturing | |
| 2411 | Radium luminous compounds, manufacturing | |
| 1200 | Radium mine | |
| 1200 | Radium ore mining | |
| 7422 | Radon testing services | |
| 3511 | Rafts, rubber inflatable, manufacturing | |
| 5149 | Rags, paper, rubber and bottles (scrap), wholesale | |
| 5149 | Rags, wholesale | |
| 3120 | Rail bonds, electric, for propulsion and signal circuits, manufacturing | |
| 2710 | Rail joints and fastenings, made in steel mills | |
| 3520 | Rail laying and tamping equipment, manufacturing | |
| 6021 | Rail transportation, commuter | |
| 5143 | Railings, hand and guard, metal and/or plastic, wholesale | |
| 2811 | Railings, metal, manufacturing | |
| 2022 | Railings, wood stair, manufacturing | |
| 5143 | Railings, wooden, wholesale | |
| 7513 | Railroad and warehouse commissions | |
| 7513 | Railroad and warehouse commissions, non-operating | |
| 2891 | Railroad bumping posts, forged, unfinished, made from purchased iron or steel | |
| 2913 | Railroad car journal bearings, plain, manufacturing | |
| 6301 | Railroad car loading and unloading | |
| 7111 | Railroad car rental | |
| 7111 | Railroad car rental, with care of lading | |
| 7111 | Railroad car rental, without care of loading | |
| 3520 | Railroad car repair (except factory rebuilding of rolling stock) | |
| 3520 | Railroad cars and car equipment, manufacturing | |
| 3520 | Railroad cars, rebuilding | |
| 3520 | Railroad cars, self-propelled, manufacturing | |
| 5150 | Railroad cars, wholesale | |
| 4520 | Railroad construction, general contractors | |
| 2710 | Railroad crossings, iron or steel, made in steel mills | |
| 5150 | Railroad equipment and supplies, wholesale | |
| 6309 | Railroad freight agencies, not operated by railroad companies | |
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