# Relationship history for MSHA mine 2302213

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Tory East 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Martin Marietta Materials Inc → Tory East Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Creek Quarry Inc → Tory East Quarry; 2000-12-01 to 2026-08-17; source msha-controller-operator-history
- **controller_controls_mine:** C Scott  Hiebert  et al → Tory East Quarry; 2000-12-01 to 2025-07-15; source msha-controller-operator-history
- **controller_controls_operator:** C Scott  Hiebert  et al → Big Creek Quarry Inc; 2000-12-01 to 2025-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Barklage  et al → Big Creek Quarry Inc; 2000-12-01 to 2025-07-15; source msha-controller-operator-history
- **controller_controls_mine:** C Scott  Hiebert → Tory East Quarry; 2025-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C Scott  Hiebert → Big Creek Quarry Inc; 2025-07-16 to 2026-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Tory East Quarry; 2026-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2026-08-18 to current/open; source msha-controller-operator-history