| Agent Name | NB, NIOBIUM-MF UNKNOWN |
| CAS # | 7440-03-1 |
| RTECS # | |
| Agent Code | 19985 |
| Code | Occupation Description (1980) | Total # Employees (Male & Female) |
Total # Female Employees |
| 045 | METALLURGICAL AND MATERIALS ENGINEERS | 64 | |
| 055 | ELECTRICAL AND ELECTRONIC ENGINEERS | 5 | |
| 073 | CHEMISTS, EXCEPT BIOCHEMISTS | 121 | 8 |
| 075 | GEOLOGISTS AND GEODESISTS | 28 | |
| 216 | ENGINEERING TECHNICIANS, N.E.C. | 40 | |
| 224 | CHEMICAL TECHNICIANS | 173 | 39 |
| 363 | PRODUCTION COORDINATORS | 8 | |
| 364 | TRAFFIC, SHIPPING, AND RECEIVING CLERKS | 8 | |
| 365 | STOCK AND INVENTORY CLERKS | 750 | |
| 374 | MATERIAL RECORDING, SCHEDULING, AND DISTRIBUTING CLERKS, N.E.C. | 13 | |
| 453 | JANITORS AND CLEANERS | 7,924 | |
| 515 | AIRCRAFT MECHANICS, EXC. ENGINE | 45 | |
| 516 | HEAVY EQUIPMENT MECHANICS | 11 | |
| 518 | INDUSTRIAL MACHINERY REPAIRERS | 776 | |
| 519 | MACHINERY MAINTENANCE OCCUPATIONS | 27 | |
| 523 | ELECTRONIC REPAIRERS, COMMUNICATIONS AND INDUSTRIAL EQUIPMENT | 382 | |
| 533 | MISCELLANEOUS ELECTRICAL AND ELECTRONIC EQUIPMENT REPAIRERS | 11 | |
| 534 | HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS | 243 | |
| 539 | MECHANICAL CONTROLS AND VALVE REPAIRERS | 37 | |
| 544 | MILLWRIGHTS | 717 | |
| 547 | SPECIFIED MECHANICS AND REPAIRERS, N.E.C. | 93 | |
| 549 | NOT SPECIFIED MECHANICS AND REPAIRERS | 1,675 | |
| 558 | SUPERVISORS, N.E.C. | 64 | |
| 563 | BRICKMASONS AND STONEMASONS | 129 | |
| 575 | ELECTRICIANS | 43 | |
| 585 | PLUMBERS, PIPEFITTERS, AND STEAMFITTERS | 826 | 20 |
| 588 | CONCRETE AND TERRAZZO FINISHERS | 1,939 | |
| 634 | TOOL AND DIE MAKERS | 61 | |
| 637 | MACHINISTS | 727 | |
| 643 | BOILERMAKERS | 74 | 6 |
| 653 | SHEET METAL WORKERS | 361 | 43 |
| 684 | MISCELLANEOUS PRECISION WORKERS, N.E.C. | 620 | |
| 689 | INSPECTORS, TESTERS, AND GRADERS | 13 | |
| 696 | STATIONARY ENGINEERS | 3 | |
| 703 | LATHE AND TURNING MACHINE SET-UP OPERATORS | 24 | |
| 704 | LATHE AND TURNING MACHINE OPERATORS | 61 | |
| 706 | PUNCHING AND STAMPING PRESS MACHINE OPERATORS | 535 | |
| 707 | ROLLING MACHINE OPERATORS | 904 | |
| 708 | DRILLING AND BORING MACHINE OPERATORS | 7 | |
| 709 | GRINDING, ABRADING, BUFFING, AND POLISHING MACHINE OPERATORS | 683 | 3 |
| 715 | MISCELLANEOUS METAL, PLASTIC, STONE, AND GLASS WORKING MACHINE OPERATORS | 24 | |
| 717 | FABRICATING MACHINE OPERATORS, N.E.C. | 199 | 57 |
| 724 | HEAT TREATING EQUIPMENT OPERATORS | 291 | |
| 727 | SAWING MACHINE OPERATORS | 3 | |
| 755 | EXTRUDING AND FORMING MACHINE OPERATORS | 1,476 | |
| 756 | MIXING AND BLENDING MACHINE OPERATORS | 21 | |
| 757 | SEPARATING, FILTERING, AND CLARIFYING MACHINE OPERATORS | 133 | |
| 758 | COMPRESSING AND COMPACTING MACHINE OPERATORS | 13 | |
| 766 | FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD | 675 | |
| 768 | CRUSHING AND GRINDING MACHINE OPERATORS | 5 | |
| 769 | SLICING AND CUTTING MACHINE OPERATORS | 1,768 | |
| 777 | MISCELLANEOUS MACHINE OPERATORS, N.E.C. | 342 | 3 |
| 779 | MACHINE OPERATORS, NOT SPECIFIED | 37 | |
| 783 | WELDERS AND CUTTERS | 19,098 | 184 |
| 785 | ASSEMBLERS | 4,056 | 96 |
| 796 | PRODUCTION INSPECTORS, CHECKERS, AND EXAMINERS | 69 | |
| 797 | PRODUCTION TESTERS | 21 | |
| 798 | PRODUCTION SAMPLERS AND WEIGHERS | 8 | |
| 804 | TRUCK DRIVERS, HEAVY | 328 | |
| 849 | CRANE AND TOWER OPERATORS | 618 | |
| 856 | INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS | 21 | |
| 859 | MISCELLANEOUS MATERIAL MOVING EQUIPMENT OPERATORS | 16 | |
| 865 | HELPERS, CONSTRUCTION TRADES | 288 | |
| 869 | CONSTRUCTION LABORERS | 1,616 | |
| 873 | PRODUCTION HELPERS | 72 | |
| 883 | FREIGHT, STOCK, AND MATERIAL MOVERS, HAND, N.E.C. | 85 | |
| 889 | LABORERS, EXCEPT CONSTRUCTION | 1,076 | |
| TOTAL | 52,588 | 458 | |
*(1) The estimates for each occupation apply across the surveyed industries in which the agent was observed. Not all industries were surveyed, and not all agents were observed in all surveyed industries. (2) When using the estimates, standard errors associated with estimates should be considered. (3) Potential exposures to a chemical agent are categorized as actual (i.e., the surveyor observed the use of the specific agent) or tradename (i.e., the surveyor observed the use of a tradename product known to contain the specific agent). The estimates presented in the table combine both categories.