# Relationship history for MSHA mine 3602189

Current hierarchy: **Matthew A  Guarna → Schuylkill Coal Processing Inc → Schuylkill Coal Processing**

- 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:** Malho Coal Company → Schuylkill Coal Processing; 1950-01-01 to 1986-01-12; source msha-controller-operator-history
- **controller_controls_mine:** Ralph  Mahlo → Schuylkill Coal Processing; 1950-01-01 to 1986-01-12; source msha-controller-operator-history
- **controller_controls_operator:** Ralph  Mahlo → Malho Coal Company; 1950-01-01 to 1986-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Malho Coal Company Inc → Schuylkill Coal Processing; 1986-01-13 to 1990-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Daniel K  Cook → Schuylkill Coal Processing; 1986-01-13 to 1992-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Daniel K  Cook → Malho Coal Company Inc; 1986-01-13 to 1990-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Schuylkill Coal Processing Inc → Schuylkill Coal Processing; 1990-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nancy L  Lindenmuth → Schuylkill Coal Processing; 1990-03-23 to 2022-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Nancy L  Lindenmuth → Schuylkill Coal Processing Inc; 1990-03-23 to 2022-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Vince  Guarna → Schuylkill Coal Processing; 2022-06-21 to 2024-11-21; source msha-controller-operator-history
- **controller_controls_operator:** Vince  Guarna → Schuylkill Coal Processing Inc; 2022-06-21 to 2024-11-21; source msha-controller-operator-history
- **controller_controls_mine:** Matthew A  Guarna → Schuylkill Coal Processing; 2024-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew A  Guarna → Schuylkill Coal Processing Inc; 2024-11-22 to current/open; source msha-controller-operator-history