# Relationship history for MSHA mine 3003528

Current hierarchy: **Todd M  Burnett → Burnett Stone Inc → Fern Gully 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

- **operator_operates_mine:** Burnett Flagstone → Fern Gully Quarry; 2006-01-10 to 2014-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Todd M  Burnett → Fern Gully Quarry; 2006-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd M  Burnett → Burnett Flagstone; 2006-01-10 to 2014-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Burnett Stone Inc → Fern Gully Quarry; 2014-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Todd M  Burnett → Fern Gully Quarry; 2014-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd M  Burnett → Burnett Stone Inc; 2014-10-15 to current/open; source msha-controller-operator-history