# Relationship history for MSHA mine 3003394

Current hierarchy: **Dave  Burrell → BURRELL'S EXCAVATING INC. → K.M.C. II SAND & GRAVEL**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Dave  Burrell  et al → K.M.C. II SAND & GRAVEL; 1999-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BURRELL'S EXCAVATING INC. → K.M.C. II SAND & GRAVEL; 2002-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Burrell  et al → BURRELL'S EXCAVATING INC.; 2002-01-15 to current/open; source msha-controller-operator-history