Public regulatory phone
(303) 287-3456
Associations below come from public FCC regulatory records. Confidence describes the source relationship, not current ownership of the number.
| Company or contact | FRN | System | Source record | Confidence | Observed |
|---|---|---|---|---|---|
| DERR AND GRUENEWALD CONSTRUCTION CO L | 0023723091 | ULS | 14f9cb05a1bd9e611397acc4513349117d0367d5a9af764b3555e6b9e90dccce | Authoritative identifier (100.0%) | 2026-09-15 06:16:00 |
| Derr and Gruenewald Construction Company L | 0017626581 | ULS | 0ce9f1eb2d21757c20bd237d3aa75fc75ed424ebba51ea82be86b7367fc66590 | Authoritative identifier (100.0%) | 2026-08-24 10:44:20 |