# Relationship history for MSHA mine 2103454

Current hierarchy: **Mike Dean  Scheffler → Red Rock Quarry → Portable #1 (Red Rock 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:** Herb L  Scheffler → Portable #1 (Red Rock Quarry); 1991-06-01 to 2023-01-04; source msha-controller-operator-history
- **operator_operates_mine:** L & S Construction Corp → Portable #1 (Red Rock Quarry); 2004-07-13 to 2010-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Herb L  Scheffler → L & S Construction Corp; 2004-07-13 to 2010-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Red Rock Quarry → Portable #1 (Red Rock Quarry); 2010-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donalee A  Scheffler → Portable #1 (Red Rock Quarry); 2010-02-17 to 2025-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Donalee A  Scheffler → Red Rock Quarry; 2010-02-17 to 2025-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Mike Dean  Scheffler → Portable #1 (Red Rock Quarry); 2023-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike Dean  Scheffler → L & S Construction Corp; 2023-01-05 to 2010-02-16; source msha-controller-operator-history
- **controller_controls_mine:** Mike Dean  Scheffler → Portable #1 (Red Rock Quarry); 2025-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike Dean  Scheffler → Red Rock Quarry; 2025-06-25 to current/open; source msha-controller-operator-history