# Relationship history for MSHA mine 3004070

Current hierarchy: **Dave  Burrell → BURRELL'S EXCAVATING INC. → KMC QUARRY**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Dave  Burrell  et al → KMC QUARRY; 1999-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Burrell's Excavating Inc. → KMC QUARRY; 2021-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Burrell  et al → Burrell's Excavating Inc.; 2021-04-22 to current/open; source msha-controller-operator-history