1 | NRPX | Northrop Corp. | added 4/1990; 1/1994; eliminated 7/1994; 7/2000-7/2005 (not listed) | | NAKINA |
2 | NRPX | National Rosin Oil & Size Co. | 8/1920-7/1935 | | NAKINA |
3 | NRPX | Northrop Corp. | added 4/90; 1/94; eliminated 7/94; 7/2000 | | NRHS |
4 | NRPX | *NATIONAL ROSIN OIL & SIZE CO. | | | PWRC |
5 | NRPX | +NORTHROP CORPORATION | | | PWRC |
6 | NRPX | Northrop Corporation | | | RSRV |